No startup sound (I constantly need to restart PRAM)

Hello,
I have a MacBook Pro 2012 mid 13" and some time ago I noticed, that startup sound was gone. I googled a little bit and saw that resetting PRAM should solve the problem. It did. But after a few days startup sound was gone again. So I reseted PRAM once again, and it fixed the problem. Now the sound is gone again and I'm tired of reseting PRAM, I'm pretty sure that's not how it should be. Does anyone have any idea what's the problem here? Maybe that's a sign that I need to change my RAM? :s

Stupid me, the sound was muted, so there was no startup sound everytime. I just restarted my macbook with volume up and now it works perfectly. Problem solved.

Similar Messages

Macbook pro constantly need to restart

my new macbook pro recently constantly prompts me that it needs to be restarted, especially when connected to iphone. anyone encountered the same thing? what's the likely cause? if it's a software issue, how to figure out which software is damaged? thanks!

That's a kernel panic.
kernel panic
F.J.’s User Tip: Kernel Panic
Have you updated everything that pops up when you run Software Update?

Tried to open my old MacBook. Couldn't remember password. Followed suggestion to reinstall hardware. Now startup disk is stuck in computer and it won't turn on. I keep getting a message saying I need to restart the computer. Any ideas?

Tried to open my old MacBook. Couldn't remember password. Followed suggestion to reinstall hardware. Now startup disk is stuck in computer and it won't turn on. I keep getting a message saying I need to restart the computer. When I hold down power button, I get the same message over and over. Any ideas?

Hello m.goo, and a warm welcome to the forums!
To eject the Disc, hold the Mouse button down, (or what passes for it on a Laptop), while powering up, if you also hold the Option key down at the same time it should eject & give you a chance to insert your install disc & wait for it to shw as a Boot option.
"Try Disk Utility
1. Insert the Tiger Mac OS X Install disc , then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, *you must select your language first.)*
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
Then Safe Boot , (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it finishes.
If it appears to be time for An Archive & Install, which gives you a new OS, but can preserve all your files, APPs, pics, music, settings, etc., as long as you have plenty of free disk space...
http://docs.info.apple.com/article.html?artnum=107120
Be sure to use Preserve Users & Settings.
To check if AppleCare applies, AppleCare Products Overview...
http://www.apple.com/support/applecare/overview/

My Mac is getting slower and slower, I need to restart it constantly.

I mostly use it just to browser the internet, watch movies and listen to music, but recently I have notice that I have to restart it at least once a day to keep the software working nicely with out any lags. Any tips or suggestions? I don't think I need any hardware update.
Cheers!

Problem description:
Computer getting slower, need to restart it constantly.
EtreCheck version: 2.1.8 (121)
Report generated March 22, 2015 at 17:52:54 CST
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Pro (Retina, Mid 2012) (Verified)
    MacBook Pro - model: MacBookPro10,1
    1 2.3 GHz Intel Core i7 CPU: 4-core
    8 GB RAM Not upgradeable
        BANK 0/DIMM0
            4 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            4 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless: en0: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 144
Video Information: ℹ️
    Intel HD Graphics 4000
        Color LCD spdisplays_2880x1800Retina
    NVIDIA GeForce GT 650M - VRAM: 1024 MB
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 0:55:13
Disk Information: ℹ️
    APPLE SSD SM256E disk0 : (251 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
        Macintosh HD (disk1) / : 249.80 GB (114.63 GB free)
            Encrypted AES-XTS Unlocked
            Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. Apple Internal Keyboard / Trackpad
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Configuration files: ℹ️
    /etc/hosts - Count: 11
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
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    [loaded]    foo.tap (1.0) [Click for support]
    [loaded]    foo.tun (1.0) [Click for support]
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    [loaded]    com.karios.driver.DuetDisplay (1 - SDK 10.10) [Click for support]
    [loaded]    com.sophos.kext.sav (9.2.50 - SDK 10.8) [Click for support]
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    [not loaded]    com.elgato.driver.DontMatchVoyager (1.1) [Click for support]
    [loaded]    com.screenrecycler.driver.ScreenRecyclerDriver (1.4.13 - SDK 10.4) [Click for support]
Launch Agents: ℹ️
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    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.AdobeCreativeCloud.plist [Click for support]
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    [running]    net.culater.SIMBL.Agent.plist [Click for support]
Launch Daemons: ℹ️
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    [running]    com.adobe.adobeupdatedaemon.plist [Click for support]
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.ea.origin.ESHelper.plist [Click for support]
    [loaded]    com.google.keystone.daemon.plist [Click for support]
    [loaded]    com.macpaw.CleanMyMac2.Agent.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
    [running]    com.sophos.common.servicemanager.plist [Click for support]
    [loaded]    com.symantec.ajaxserver.plist [Click for support]
    [loaded]    com.tunnelbear.mac.tbeard.plist [Click for support]
    [running]    vyprvpnservice.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [running]    com.nds.pcshow.plist [Click for support]
    [loaded]    com.nds.pcshow.uninstall.plist [Click for support]
    [running]    com.spotify.webhelper.plist [Click for support]
    [loaded]    com.valvesoftware.steamclean.plist [Click for support]
    [loaded]    net.infinite-labs.SIMBLEnablerForSandboxedApps.plist [Click for support]
User Login Items: ℹ️
    duet    Application (/Applications/duet.app)
    Flux    Application (/Users/[redacted]/Applications/Flux.app)
    iTunesHelper    Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dump Truck    Application (/Applications/Dump Truck.app)
    EyeTV Helper    Application (/Library/Application Support/EyeTV/EyeTV Helper.app)
    VyprVPN    Application (/Applications/VyprVPN.app)
Internet Plug-ins: ℹ️
    AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 [Click for support]
    FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
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    SharePointBrowserPlugin: Version: 14.4.8 - SDK 10.6 [Click for support]
    PepperFlashPlayer: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
Safari Extensions: ℹ️
    1Password
    Adblock Plus
    Disconnect
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    Save to Pocket
Audio Plug-ins: ℹ️
    DVCPROHDAudio: Version: 1.3.2
3rd Party Preference Panes: ℹ️
    Flash Player [Click for support]
Time Machine: ℹ️
    Skip System Files: NO
    Mobile backups: OFF
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 249.80 GB Disk used: 135.17 GB
    Destinations:
        LaCie [Local]
        Total size: 2.00 TB
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        Oldest backup: 2015-01-07 06:26:03 +0000
        Last backup: 2015-03-22 04:27:28 +0000
        Size of backup disk: Excellent
            Backup size 2.00 TB > (Disk size 249.80 GB X 3)
Top Processes by CPU: ℹ️
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         3%    parentalcontrolsd
         2%    Little Snitch Agent
         1%    pbs
Top Processes by Memory: ℹ️
    426 MB    Safari
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    2 MB    Page-outs
Diagnostics Information: ℹ️
    Mar 22, 2015, 04:56:56 PM    /Library/Logs/DiagnosticReports/vyprvpnservice_2015-03-22-165656_[redacted].cra sh
    Mar 22, 2015, 04:56:42 PM    Self test - passed
    Mar 21, 2015, 08:38:01 PM    /Library/Logs/DiagnosticReports/vyprvpnservice_2015-03-21-203801_[redacted].cra sh
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    Mar 20, 2015, 07:12:03 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/OriginClient_2015-03-20-191203 _[redacted].crash
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    Mar 19, 2015, 07:49:34 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/PopcornTime_2015-03-19-194934_ [redacted].crash

When try to listen sounds, need to restart

when i try to listen any sound, no matters if it's on itunes or any other source, i will need to restart the mac in order to hear anything.
everytime the mac goes into standby, after i haev to restart because there will be no more sound.
anybody knows whats the matter?

have you got a solution to this?
in the same time as this problem begun, also the battery lifetime decrease massive. from full battery lifetime of 9 and even more hours when i bought the mac 3 months ago,now since a couple days (simultanely with the sound problem) the full lifetime is only 7 and less hours.
the battery check says "good" and 82 cycles.
but it won't load up to 5500 mah full capacity, instead it only loads up to 4400 mah and shows 100% loaded.
i don't know how the 2 problems are realtionated to each other, but there seems to be a connection...
i already did a calibration.
lost.
and guess after 3 month lifetime those things should work like new,,,,

Help with Kernal Panic; "You need to restart your computer..." on startup

My sister just gave me her old iBook G4. I don't know what OS it is running and I don't know the exact model beyond iBook G4. She is currently looking for the disks that came with it.
Everytime I try to start the computer, before I get past the screen with the apple, the screen goes grey and I get the following message:
"You need to restart your computer. Hold down the Power button for several seconds or press the Restart button."
Are there any diagnostics I can run without the discs that came with the computer? What should my first steps be? Is there any way to tell what OS or hardware I'm using without being able to boot up?
Thanks,
Brett

Hi Brett and welcome to Apple Discussions.
You could try Starting up in Safe Mode
What is Safe Boot, Safe Mode
Safe Boot takes longer than normal startup
Safe boot may by-pass the problematic process/hardware (the airport card is a frequent culprit) and enable you to boot sufficiently to find out the OS. Click on the blue Apple top/left, then 'About this Mac'. If Safe Boot is successful take a look at Macintosh HD/Library/Logs, particularly Console and Panic. I'm no expert on deciphering logs but you could copy/past the last couple of paragraphs of Panic into a reply.
Good luck,
Adrian

On startup: "You need to restart your computer. Hold down ..."

When I start up from system folder 10.4.3 on hard disk, I get this message:
"You need to restart your computer. Hold down the Poweer button for several seconds or press the Restart button."
When I do this, my eMac restarts but returns to this very same message.
I did recently fix disk permissions using Hard Disk Utility. Tech Tools program reports no failures.
How can I restart my computer?

Find some body that can download and and burn you a copy of techtool 3.0.4 contact micromat and see if they know of a way to roll back a repair. Diskwarrior might help. There again check for the version number compatibility. Utilities are not like they use to be on OS9 and below; here you could use a version designed for lower OS and get by using it.
Todays utilities are based on the operating system themselves. There was a Major change in the version of UNIX used in OS X.3 and X.4 previously they used BSD (Berkley Systems Development) originated my Berkley University. Apple had to pay a Royalty payment for each copy sold. OSX uses FreeBSD UNIX which originally started from BSD UNIX; but, was taken over by the General UNIX community under a License like Mozilla uses for FIreFox and others. Anyway it can be used Royalty free. What's better is FreeBSD is constantly being improved literally daiyly; and therefore is much improved.
I digress. because of these differences the utilities must be written for the differences in code. And what worked on one doesn't on the other.

Need to restart my laptop every time to get sound.

Hi ,
I got a problem with Sound in Windows 8 Operating System (hP G60 model)..Device drivers are installed properly ..!! I need to restart my laptop every time problem occurs..if i restart the laptop, sound is working fine..!!..I have no idea why its not coming sound when i first switch on laptop.!every time i need to restart laptop for sound.! one more problem is if i haven't used laptop for 15-20min it goes sleeping mode and when i used back - again facing same problem.!!..Does i need to install any drivers?..Does it require?..Plz help me out..Thank your for your help in advance.!!
This question was solved.
View Solution.

Hi,
One thing to check is the following.
Open windows Control Panel, open Windows Update, select 'View update history' in the left hand pane and then select 'Installed updates' link in the following window.
Locate update KB2962407, right click it and select Uninstall. When done, restart the notebook, open windows Control Panel, open Windows Update and select 'Check for updates'. You'll see the update you just uninstalled being offered again - right click and select 'Hide Update'.
When windows has reloaded, you may or may not need to use recovery manager to reinstall your original Audio Driver as detailed in the document on the link below.
Recovery Manager - Windows 8.
Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

Can't get past a grey "you need to restart your computer screen"

Hello,
I have a few month old iMac 27" i7 quad core for music use and did an update this morning which consisted of an itunes update and update to the screen firmware and two other things I can't remember. Do the usual install and restart business and am now met with the following error:
panic(cpu 0 caller 0x558271): "Unable to find device driver for this platform: \"ACPI". \n"@/SourceCache/xnu/xnu-1504.3.12......................
Debugger called: <panic>
Backtrace (CPU 0) , Frame: Return Address (4 potential args on stack)
7 lines of numbers and letters (please let me know if you need these)
BSD process name correspoding to current thread: Unknown
Mac OS Version:
Not yet set
Kernal Version:
Darwin Kernel Version 10.3.0...............
System uptime in nanoseconds: 322691563
This is on the grey screen with the multi lingual "you need to restart your computer message"
Holding shift on startup bypasses the screen and allows me to eject the disk and boot in safe mode or whatever it's called but the bar down the bottom fills up and I'm just left with the rotating bars and the apple logo.
I have tried a few different suggestions I have found on other threads about holding a certain key to start in safe mode or something to that effect but nothing has worked.
I have inserted the OSX install dvd that came with the computer and restarted but that did nothing and now I cannot eject it.
I have backed up a lot of the stuff on there but it will be a huuuuuge inconvenience if I lose the data on this thing.
Any help is greatly appreciated!
Cheers,
Stephen

This is called a "kernel panic" (the multi-lingual restart screen). Solving them can be tricky. From the sounds of it, you can probably rule out hardware, but you probably have pretty severe system damage, probably caused by bad hard drive damage. But without more information, it's hard to say. Try looking over [the X Lab FAQ on resolving kernel panics|http://www.thexlab.com/faqs/kernelpanics.html].

Panic Kernal: You need to restart your computer, Help please...

Yesterday I installed an update on my MacBook and everything went haywire. I installed the Apple updates
that were recommended for my computer when it did it's weekly update
check. After the install I quit all open applications and did a
restart per the on screen prompt. Finder closed and the computer just
sat for over a half hour and never would finish shutting down. No key
strokes or commands would do anything. As a last ditch effort I held
the power key down until it shut down. I waited a minute then powered
back up. The gray screen with the apple logo comes up then the spinning wheel. Then a
panic kernal saying the computer needs to be restarted. I tried ten
times then I reset the PRAM then I did two hardware checks. First the
short check then the long one. Both tests showed all hardware to be
fine.Then I called Apple. They told me to reset the PRAM, told me to
do a hardware check then told me to boot in safe mode. Then told me to
try an archive reinstall by inserting disc one, power on, then hold
the C key after the startup chime sounds. One of two things happen
when this is done, it either goes to a blank blue screen or the "You
need to restart the computer" message comes up. If I power on with the
disc in and hold the option key the hard drive and the disc shows on
the screen. If I click on the hard drive the "restart message comes up. If I
click on the disc the blank blue screen usually comes up but twice the
"restart" message came up. I have tried all of the start-up key strokes, Once I got into safe mode but I can't get into it anymore, it now gives the you need to restart message. I can get into Verbose and Single user mode but I don't know of anything to try once I'm in either of those modes.I tried to boot system from single user mode by typing in the command sh /etc/rc but a long list of code just comes up and says something about the panic kernal which I believe is telling me that the same problem
I have trying a normal boot is keeping it from booting in single user mode also. I can do a hardware test(I've done this 3 times and everything shows to be OK). The main problem I have now is it won't boot normally and it won't boot from the install disc so I am truly stuck. I am at a loss as to what I should try next
since I can't even reinstall the software. Any help will be greatly
appreciated especially since my free phone help ended 2 days ago and
today was the first time I ever needed it!!
thanks, Jason

Thanks for replying, I have no peripherals attached, I am booting from the MacBook Tiger DVD one that came with the machine. I get the panic kernal with or without the disc installed. All hardware checks out fine in the three hardware checks I've done. I am almost positive the problem is stemming from the Apple updates performed since this is exactly when my problems began(trying to restart after the Apple updates). I just can't get the machine to boot from the disc no matter what I try so I can reinstall the operating system. I even tried using an external DVD-ROM once to see if it would boot from it but it did the exact same thing as when I try booting from the internal drive. Yes my files are backed up to an external hard drive. I've got no problem doing a Nuke and Repave if I must but since it won't boot from the disc I don't know how I can even do this. I know it is under warranty but since the hard ware checks OK it looks like there would be a way to get it running again without sending it in for repairs. However I am starting to think that's what I'm gonna have to do. I'm just glad I still have an old clamshell iBook to work with so I can access the internet to seek help. Thanks for your input, can you think of anything else I could try?

You need to restart your computer ...

Hi,
Just started getting the message, You need to restart your computer ...
The mac constantly crashes at startup, it even crashes from CD start-up.
I have;
1-reset nvram
2-changed battery
3-zapped pram
4-changed ram
5-changed video card
6-removed everything except power cable
7-removed battery, unplugged for several hours, tried to re-boot
8-tried to boot to safe mode, but holding shift does not seem to work, although I use a swedish keyboard, and some of the comMands are in different places (anyone know where the shift command is, on a Swedish keyboard)
9-screamed, shouted!
All with the same results.
The mac powers up, fans work. the red light is on the motherboard, but it just cannot boot (except for a couple of times, but then froze after several minutes).
If it gets to the blue screen it is usually the , 'You need to restart...' message, but I have also had 'System failure: CPU=01, 00000001 (corrupt stack) plus a few variations on this message.
A few of the crashes have lines of code/test covering the screen ending in 'we are hanging here'.
I am thinking it must be the CPU?, as the mac powers up, and does try to start.
As you will see from my info, the CPU is a 1.47 MHz upgrade.
I hope someone can help, cheers.

Hi,
I use a swedish keyboard, and some of the comMands are in different places (anyone know where the shift command is, on a Swedish keyboard)
Looks like both Shift keys are in the same place as here...
corrupt stack
Usually that means bad RAM, but it could be anything from CPU to Logic Board.
Does it get further along in the boot if it's cooled for a few hours?

How do I mute the startup sound

How do I mute the startup sound on my imac

The start up sound is there for specific reasons, for example if you do a Safe Boot or PRAM reset you need the start up sound to do those key functions. I would recommend against masking it and follow Apple's suggestions. Please read your owners manual, where Apple states:
Putting Your iMac to Sleep
If you‘ll be away from your iMac for less than a few days, put it to sleep. When your iMac is in sleep, its screen is dark. You can quickly wake your iMac and bypass the startup process.
This means don't turn it off, my iMac is about 5 years old now. The only time it's restarted is when I'm doing updates, it has reliably that way and has never given me any problems. In short, let it sleep when it's not being used.

10.4.7 Update-Cannot Restart, Despite Message "You need to restart your..."

Aloha, All.
I know there's a string on this, BUT. . . it's gotten rather full, and in one of the contributor's words, "over-generalized."
Here are the specific details of my problem:
Used Software Update to download and update to OS X 10.4.7 on my 15" G4 1.5mhz PowerBook. When I tried to restart (and I have tried MANY times now), the machine gets to the grey Apple and displays a Black rectangular message box which says:
"You need to restart your computer. Hold down the Power button for several seconds or press the Restart button."
(By the way, this message is also displayed in French, German, and Japanese - how thoughtful of Apple to our global neighbors.)
Anyway, I've zapped the PRAM. I've used Option/Power button and selected the hard drive as startup drive. I've tried both "fixes" several time, but no luck.
I've finally resorted to using Firewire Target Mode, and have transferred my important files over to my trusty, old TiBook (runs Panther 10.3.9, and always starts). However, before I take that next rather drastic step of a Clean Install, I'm reaching out to ask whether anyone has found a more elegant, less draconian fix than wiping the hard drive clean and starting all over again??
Anyone?
Thank you very much.
HJ
15"AL PwrBk-1.5mhz-2GB RAM; 15"TiPwrBk-1GB RAM; 2 G4PwrMacs-Loaded Mac OS X (10.4.6)
15"AL PwrBk-1.5mhz-2GB RAM; 15"TiPwrBk-1GB RAM; 2 G4PwrMacs-Loaded Mac OS X (10.4.6)

Adrian - Mahalo Nui Loa!! (Translation from Hawaiian: "Thank you very much!!")
I started up in Safe Mode, "hid" 3rd party Startup items, and my PwrBk started up w/ no problem and fully loaded w/OS X v 10.4.7!
The offending Startup item was a fun little app - SoundShuffler v. 1.7 by No-U-Turn software, which as the name implies, runs System Alerts (standard, or user-installed) at random, or other configurations. I checked out No-U-Turn's website, and while there was nothing to indicate date of their last update (v. 1.7), the fact that the OS X requirement was "10.1 or higher" may say something.
SoundShuffler harkens back to days of OS 7, 8, and 9, and a similar little app, SpeedBeep, which has since gone extinct. In fact, SoundShuffler allowed me to run all the advanced OS X features and apps, but with the nostalgia of original OS 7, 8, and 9 System Alerts, played at random whenever I mis-executed a keystroke command, etc. (which means I heard them often).
I still have all the sounds available (some were genuine, which I've converted into .aiff), but can only choose them individually. For now, anyway, because I did leave an e-mail message at No-U-Turn's website advising them of SoundShuffler's Startup item's incompatibility w/ v. 10.4.7, so we'll see. . .
Well, again, Adrian, thank you very much for your sound advice (no pun intended)!!
Aloha,
HJ
15"AL PwrBk-1.5mhz-2GB RAM; 15"TiPwrBk-1GB RAM; 2 G4PwrMacs-Loaded Mac OS X (10.4.7)

No startup sound on Yosemite

After installing Yosemite, and sorting out varios issues, I still don't get a startup sound?

Hey there Rolf,
Resetting your PRAM should return your startup chime on the computer. This article will walk you through doing that on Mac OS X Yosemite:
OS X Yosemite: Reset your computer’s PRAM
Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
Important: To print these instructions, click the Share button in the Help window, then choose Print.
Choose Apple menu > Shut Down.
Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on your Mac.
Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.
Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.
Release the keys.
After resetting your computer’s PRAM, you may need to update your speaker volume, display resolution, and startup disk preferences. For more information about PRAM, see the Apple Support article About NVRAM and PRAM.
Thank you for using Apple Support Communities.
Cheers,
Sterling

Yosemite download has resulted in constantly having to restart my macbook

Since downloading an upgrade to Yosemite I am now constantly having to restart my computer for internet connectivity. Is there a simple fix?

1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve the problem. But with the aid of the test results, the solution may take a few minutes, instead of hours or days.
The test works on OS X 10.7 ("Lion") and later. I don't recommend running it on older versions of OS X. It will do no harm, but it won't do much good either.
Don't be put off by the complexity of these instructions. The process is much less complicated than the description. You do harder tasks with the computer all the time.
2. If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. Backup is always a must, and when you're having any kind of trouble with the computer, you may be at higher than usual risk of losing data, whether you follow these instructions or not.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
3. Below are instructions to run a UNIX shell script, a type of program. As I wrote above, it changes nothing. It doesn't send or receive any data on the network. All it does is to generate a human-readable report on the state of the computer. That report goes nowhere unless you choose to share it. If you prefer, you can act on it yourself without disclosing the contents to me or anyone else.
You should be wondering whether you can believe me, and whether it's safe to run a program at the behest of a stranger. In general, no, it's not safe and I don't encourage it.
In this case, however, there are a couple of ways for you to decide whether the program is safe without having to trust me. First, you can read it. Unlike an application that you download and click to run, it's transparent, so anyone with the necessary skill can verify what it does.
You may not be able to understand the script yourself. But variations of it have been posted on this website thousands of times over a period of years. The site is hosted by Apple, which does not allow it to be used to distribute harmful software. Any one of the millions of registered users could have read the script and raised the alarm if it was harmful. Then I would not be here now and you would not be reading this message. See, for example, this discussion.
Nevertheless, if you can't satisfy yourself that these instructions are safe, don't follow them. Ask for other options.
4. Here's a summary of what you need to do, if you choose to proceed:
☞ Copy a line of text in this window to the Clipboard.
☞ Paste into the window of another application.
☞ Wait for the test to run. It usually takes a few minutes.
☞ Paste the results, which will have been copied automatically, back into a reply on this page.
The sequence is: copy, paste, wait, paste again. You don't need to copy a second time. Details follow.
5. Try to test under conditions that reproduce the problem, as far as possible. For example, if the computer is sometimes, but not always, slow, run the test during a slowdown.
You may have started up in "safe" mode. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.
6. If you have more than one user, and the one affected by the problem is not an administrator, then please run the test twice: once while logged in as the affected user, and once as an administrator. The results may be different. The user that is created automatically on a new computer when you start it for the first time is an administrator. If you can't log in as an administrator, test as the affected user. Most personal Macs have only one user, and in that case this section doesn’t apply. Don't log in as root.
7. The script is a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, though you may not see all of it in the browser window, and you can then copy it. If you try to select the line by dragging across the part you can see, you won't get all of it.
Triple-click anywhere in the line of text below on this page to select it:
PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/libexec;clear;cd;p=(1289 ' 0.5 0.25 50 1000 15 5120 1000 25000 6 6 5 1 0 100 ' 51 25600 4 10 25 5120 102400 1000 25 1 400 40 500 300 85 25 20480 262144 20 2000 524288 604800 5 1024 );k=({Soft,Hard}ware Memory Diagnostics Power FireWire Thunderbolt USB Bluetooth SerialATA Extensions Applications Frameworks PrefPane Fonts Displays PCI UniversalAccess InstallHistory ConfigurationProfile AirPort 'com\.apple\.' -\\t N\\/A 'AES|atr|udit|msa|dnse|ax|ensh|fami|FileS|fing|ft[pw]|gedC|kdu|etS|is\.|alk|ODSA|otp|htt|pace|pcas|ps-lp|rexe|rlo|rsh|smb|snm|teln|upd-[aw]|uuc|vix|webf' OSBundle{Require,AllowUserLoa}d 'Mb/s:Mb/s:ms/s:KiB/s:%:total:MB:total:lifetime:sampled:per sec' 'Net in:Net out:I/O wait time:I/O requests:CPU usage:Open files:Memory:Mach ports:Energy:Energy:File opens:Forks:Failed forks:System errors' 'tsA|[ST]M[HL]' PlistBuddy{,' 2>&1'}' -c Print' 'Info\.plist' CFBundleIdentifier );f=('\n%s'{': ','\n\n'}'%s\n' '\nRAM details\n%s\n' %s{' ','\n'{"${k[22]}",}}'%s\n' '%.1f GiB: %s\n' '\n    ...and %s more line(s)\n' '\nContents of %s\n    '"${k[22]}"'mod date: %s\n    '"${k[22]}"'checksum: %s\n%s\n' );c=(879294308 4071182229 461455494 216630318 3627668074 1083382502 1274181950 1855907737 2758863019 1848501757 464843899 2636415542 3694147963 1233118628 2456546649 2806998573 2778718105 842973933 1383871077 1591517921 676087606 1445213025 2051385900 3301885676 891055588 998894468 695903914 1443423563 4136085286 3374894509 1051159591 892310726 1707497389 523110921 2883943871 3873345487 );s=(' s/[0-9A-Za-z._]+@[0-9A-Za-z.]+\.[0-9A-Za-z]{2,4}/EMAIL/g;/faceb/s/(at\.)[^.]+/\1NAME/g;/\/Shared/!s/(\/Users\/)[^ /]+/\1USER/g;s/[-0-9A-Fa-f]{22,}/UUID/g;' ' s/^ +//;/de: S|[nst]:/p;' ' {sub(/^ +/,"")};/er:/;/y:/&&$2<'${p[4]} ' s/:$//;3,6d;/[my].+:/d;s/^ {4}//;H;${ g;s/\n$//;/s: (E[^m]|[^EO])|x([^08]|02[^F]|8[^0])/p;} ' ' 5h;6{ H;g;/P/!p;} ' ' ($1~/^Cy/&&$3>'${p[9]}')||($1~/^Cond/&&$2!~/^N/) ' ' /:$/{ N;/:.+:/d;s/ *://;b0'$'\n'' };/^ 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END{if(n<'{${p[12]},${p[13]}}')printf("^'"${k[21]}"'.+")} ' '|uniq' ' 1;END { print "/L.+/Scr.+/Templ.+\.app$";print "/L.+/Pri.+\.plugin$";if(NR<'{${p[14]},${p[21]}}') print "^/[Sp].+|'${k[21]}'";} ' ' /\.(framew|lproj)|\):/d;/plist:|:.+(Mach|scrip)/s/:.+//p;' '&&echo On' '/\.(bundle|component|framework|kext|mdimporter|plugin|qlgenerator|saver|wdgt)$/p' '/\.dylib$/p' ' /Temp|emac/{next};/(etc|Preferences|Launch[AD].+)\// { sub(".","");print $0"$";} END { split("'"${c[*]}"'",c);for(i in c) print "\t"c[i]"$";} ' ' /^\/(Ap|Dev|Inc|Prev)/d;/((iTu|ok).+dle|\.(component|mailbundle|mdimporter|plugin|qlgenerator|saver|wdgt))$/p;' ' BEGIN{ FS="= "} $2 { gsub(/[()"]/,"",$2);print $2;} !/:/&&!$2{print "'${k[23]}'"} ' ' /^\//!d;s/^.{5}//;s/ [^/]+\//: \//p;' '>&-||echo No' '{print $3"\t"$1}' 's/\'$'\t''.+//p' 's/1/On/p' '/Prox.+: [^0]/p' '$2>'${p[2]}'{$2=$2-1;print}' ' BEGIN { M1='${p[16]}';M2='${p[18]}';M3='${p[8]}';M4='${p[3]}';} !/^A/{next};/%/ { getline;if($5<M1) o["CPU"]="CPU: user "$2"%, 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"$5" (status "$6"): "$2;} $1==12&&$5 { "ps -c -ocomm -p"$5"|sed 1d"|getline n;if(n) $5=n;o[$1]=o[$1]"\n    "$5" => "$3" (UID "$4"): "$2;} $1~/1[34]/ { o[$1]=o[$1]"\n    "$3" (UID "$4", error "$5"): "$2;} END { n=split("'"${k[27]}"'",u,":");for(i=n+1;i<n+4;i++)u[i]=u[n];split("'"${k[28]}"'",l,":");for(i=1;i<15;i++) if(o[i])print "\n"l[i]" ("u[i]")\n"o[i];} ' ' /^ {8}[^ ]/{print} ' ' BEGIN { L='${p[17]}';} !/^[[:space:]]*(#.*)?$/ { l++;if(l<=L) f=f"\n    "$0;} END { F=FILENAME;if(!F) exit;if(!f) f="\n    [N/A]";"cksum "F|getline C;split(C, A);C=A[1];"stat -f%Sm "F|getline D;"file -b "F|getline T;if(T~/^Apple b/) { f="";l=0;while("'"${k[30]}"' "F|getline g) { l++;if(l<=L) f=f"\n    "g;};};if(T!~/^(AS.+ (En.+ )?text(, with v.+)?$|(Bo|PO).+ sh.+ text ex|XM)/) F=F"\n    '"${k[22]}"'"T;printf("'"${f[8]}"'",F,D,C,f);if(l>L) printf("'"${f[7]}"'",l-L);} ' ' s/^ ?n...://p;s/^ ?p...:/-'$'\t''/p;' 's/0/Off/p' 's/^.{52}(.+) <.+/\1/p' ' /id: N|te: Y/{i++} END{print i} ' ' /kext:/ { 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$NF"\f"a[split($(NF-1),a," ")];} ' '|tail -n'{${p[6]},${p[10]}} ' s/.+bus /Bus: /;s/,.+[(]/ /;s/,.+//p;' ' { $NF=$NF" Errors: "$1;$1="";} 1 ' ' 1s/^/\'$'\n''/;/^ +(([MNPRSV]|De|Li|Tu).+|Bus): .|d: Y/d;s/:$//;$d;p;' ' BEGIN { RS=",";FS=":";} $1~"name" { gsub("\"","",$2);print $2;} ' '|grep -q e:/' '/[^ .]/p' '{ print $1}' ' /^ +N.+: [1-9]/ { i++;} END { if(i) print "system: "i;} ' ' NF { print "'{admin,user}' "$NF;exit;} ' ' /se.+ =/,/[\}]/!d;/[=\}]/!p ' ' 3,4d;/^ +D|Of|Fu| [0B]/d;s/^ |:$//g;$!H;${ x;/:/p;} ' ' BEGIN { FS=": ";} NR==1 { sub(":","");h="\n"$1"\n";} /:$/ { l=$1;next;} $1~"S"&&$2!~3 { getline;next;} /^ {6}I/ { i++;L[i]=l" "$2;if(i=='${p[24]}') nextfile;} END { if(i) print h;for(j=0;j<i;j++) print L[i-j];} ' ' /./H;${ x;s/\n//;s/\n/, /g;/,/p;} ' ' {if(int($6)>'${p[25]}')printf("swap used %.1f\n",$6/1024)} ' ' BEGIN{FS="\""} $3~/ t/&&$2!~/'{${k[24]},${k[29]}}'/{print $2} ' ' int($1)>13 ' p ' BEGIN{FS="DB="} { sub(/\.db.*/,".db",$2);print $2;} ' {,1d\;}'/r%/,/^$/p' ' NR==1{next} NR>11||!$0{exit} {print $NF"\f"substr($0,1,32)"\f"$(NF-7)} ' '/e:/{print $2}' ' /^[(]/{ s/....//;s/$/:/;N;/: [)]$/d;s/\n.+ ([^ ]+).$/\1/;H;};${ g;p;} ' '1;END { exit "find /var/db/r*/'${k[21]}'*.{BS,Bas,Es,J,OSXU,Rem,up}*.bom -mtime -'${p[23]}'s"|getline;} ' );c1=(system_profiler pmset\ -g nvram fdesetup find syslog df vm_stat sar ps crontab kextfind top pkgutil "${k[30]}\\" echo cksum kextstat launchctl smcDiagnose sysctl\ -n defaults\ read stat lsbom 'mdfind -onlyin' env pluginkit scutil 'dtrace -q -x aggsortrev -n' security sed\ -En awk 'dscl . -read' networksetup mdutil lsof test osascript\ -e netstat mdls route cat uname powermetrics );c2=(${k[21]}loginwindow\ LoginHook ' /L*/P*/loginw*' "'tell app \"System Events\" to get properties of login items'" 'L*/Ca*/'${k[21]}'Saf*/E* -d 2 -name '${k[32]} '~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $' -i '-nl -print' '-F \$Sender -k Level Nle 3 -k Facility Req "'${k[21]}'('{'bird|.*i?clou','lsu|sha'}')"' "-f'%N: %l' Desktop {/,}L*/Keyc*" therm sysload boot-args status " -F '\$Time \$Message' -k Sender kernel -k Message CRne '0xdc008012|(allow|call)ing|Goog|(mplet|nabl)ed|ry HD|safe b|xpm' -k Message CReq 'bad |Can.t l|corru|dead|fail|GPU |hfs: Ru|inval|Limiti|v_c|NVDA[(]|pagin|Purg(ed|in)|error|Refus|TCON|tim(ed? ?|ing )o|trig|WARN' " '-du -n DEV -n EDEV 1 10' 'acrx -o%cpu,comm,ruid' "' syscall::recvfrom:return {@a[execname,uid]=sum(arg0)} syscall::sendto:return {@b[execname,uid]=sum(arg0)} syscall::open*:entry {@c[execname,uid,copyinstr(arg0),errno]=count()} syscall::execve:return, syscall::posix_spawn:return {@d[execname,uid,ppid]=count()} syscall::fork:return, syscall::vfork:return, syscall::posix_spawn:return /arg0<0/ {@e[execname,uid,arg0]=count()} syscall:::return /errno!=0/ {@f[execname,uid,errno]=count()} io:::wait-start {self->t=timestamp} io:::wait-done /self->t/ { this->T=timestamp - self->t;@g[execname,uid]=sum(this->T);self->t=0;} io:::start {@h[execname,uid]=sum(args[0]->b_bcount)} tick-10sec { normalize(@a,2560000);normalize(@b,2560000);normalize(@c,10);normalize(@d,10);normalize(@e,10);normalize(@f,10);normalize(@g,10000000);normalize(@h,10240);printa(\"1\f%@d\f%s\f%d\n\",@a);printa(\"2\f%@d\f%s\f%d\n\",@b);printa(\"11\f%@d\f%s\f%d\f%s\f%d\n\",@c);printa(\"12\f%@d\f%s\f%d\f%d\n\",@d);printa(\"13\f%@d\f%s\f%d\f%d\n\",@e);printa(\"14\f%@d\f%s\f%d\f%d\n\",@f);printa(\"3\f%@d\f%s\f%d\n\",@g);printa(\"4\f%@d\f%s\f%d\n\",@h);exit(0);} '" '-f -pfc /var/db/r*/'${k[21]}'*.{BS,Bas,Es,J,OSXU,Rem,up}*.bom' '{/,}L*/Lo*/Diag* -type f -regex .\*[cght] ! -name .?\* ! -name \*ag $ -exec grep -lq "^Thread c" {} \; -exec printf \* \; -o -true $ -execdir stat -f'$'\f''%Sc'$'\f''%N -t%F {} \;' '/S*/*/Ca*/*xpc*' '-L /{S*/,}L*/StartupItems -type f -exec file {} +' /\ kMDItemContentTypeTree=${k[21]}{bundle,mach-o-dylib} :Label "/p*/e*/{auto*,{cron,fs}tab,hosts,{[lp],sy}*.conf,mach_i*/*,pam.d/*,ssh{,d}_config,*.local} {/p*,/usr/local}/e*/periodic/*/* /L*/P*{,/*}/com.a*.{Bo,sec*.ap}*t {/S*/,/,}L*/Lau*/*t .launchd.conf" list '-F "" -k Sender hidd -k Level Nle 3' /Library/Preferences/${k[21]}alf\ globalstate --proxy '-n get default' vm.swapusage --dns -get{dnsservers,info} dump-trust-settings\ {-s,-d,} -n1 '-R -ce -l1 -n5 -o'{'prt -stats prt','mem -stats mem'}',command,uid' -kl -l -s\ / '--regexp --files '${k[21]}'pkg.*' '+c0 -i4TCP:0-1023' ${k[21]}dashboard\ layer-gadgets '-d /L*/Mana*/$USER' '-app Safari WebKitDNSPrefetchingEnabled' '-Fcu +c0 -l' -m 'L*/{Con*/*/Data/L*/,}Pref* -type f -size 0c -name *.plist.???????' kern.memorystatus_vm_pressure_level '3>&1 >&- 2>&3' '-F \$Message -k Sender kernel -k Message CReq "'{'n Cause: -','(a und|I/O |jnl_io.+)err|disk.+abo','USBF:.+bus'}'"' -name\ kMDItem${k[33]} -T\ hfs '-n get default' -listnetworkserviceorder :${k[33]} :CFBundleDisplayName $EUID {'$TMPDIR../C ','/{S*/,}'}'L*/{,Co*/*/*/L*/}{Cache,Log}s -type f -size +'${p[11]}'G -exec stat -f%z'$'\f''%N {} \;' \ /v*/d*/*/*l*d{,.*.$UID}/* '-app Safari UserStyleSheetEnabled' 'L*/A*/Fi*/P*/*/a*.json' users/$USER\ HomeDirectory '{/,}L*/{Con,Pref}* -type f ! -size 0 -name *.plist -exec plutil -s {} \;' ' -F "\$Time \$(Sender): \$Message" -k Sender Rne "launchd|nsurls" -k Level Nle 3 -k Facility R'{'ne "user|','eq "'}'console" -k Message CRne "[{}<>]|asser|commit - no t|deprec|done |fmfd|Goog|ksho|ndum|obso|realp|rned f|/root|sandbox ex|sudo:" ' getenv '/ "kMDItemDateAdded>=\$time.now(-'${p[23]}')&&kMDItem'${k[33]}'=*"' -m\ / '' ' -F "\$Time \$(RefProc): \$Message" -k Sender Req launchd -k Level Nle 3 -k Message Rne "asse|bug|File ex|hij|Ig|Jet|key is|lid t|Plea|ship" ' print{,-disabled}\ {system,{gui,user}/$UID} '-n1 --show-initial-usage --show-process-energy' -r ' -F "\$Message" -k Sender nsurlstoraged -k Time ge -1h -k Level Nle 4 -k Message Req "^(ER|IN)" ' '~ "kMDItemKind=Package"' );N1=${#c2[@]};for j in {0..20};do c2[N1+j]=SP${k[j]}DataType;done;l=({Restricted\ ,Lock,Pro}files POST Battery {Safari,App,{Bad,Loaded}\ kernel,Firefox}\ extensions System\ load boot\ args FileVault\ {2,1} {Kernel,System,Console,launchd}\ log SMC Login\ hook 'I/O per process' 'High file counts' UID {System,Login,Agent,User}' services '{load,disabl}ed {Admin,Root}\ access Font\ issues Firewall Proxies DNS TCP/IP Wi-Fi 'Elapsed time (sec)' {Root,User}\ crontab {Global,User}' login items' Spotlight Memory\ pressure Listeners Widgets Parental\ Controls Prefetching Nets Volumes {Continuity,I/O,iCloud,HID,HCI}\ errors {User,System}\ caches/logs XPC\ cache Startup\ items Shutdown\ codes Heat Diagnostic\ reports Bad\ {plist,cache}s 'VM (GiB)' Bundles{,' (new)'} Trust\ settings Activity Free\ space Stylesheet Library\ paths{,' ('{shell,launchd}\)} Data\ packages );N3=${#l[@]};for i in {0..8};do l[N3+i]=${k[5+i]};done;F() { local x="${s[$1]}";[[ "$x" =~ ^([\&\|\<\>]|$) ]]&&{ printf "$x";return;};:|${c1[30]} "$x" 2>&-;printf "%s \'%s\'" "|${c1[30+$?]}" "$x";};A0() { Q=6;v[2]=1;id -G|grep -qw 80;v[1]=$?;((v[1]))||{ Q=7;sudo -v;v[2]=$?;((v[2]))||Q=8;};v[3]=`date +%s`;date '+Start time: %T %D%n';printf '\n[Process started]\n\n'>&4;printf 'Revision: %s\n\n' ${p[0]};};A1() { local c="${c1[$1]} ${c2[$2]}";shift 2;c="$c ` while [[ "$1" ]];do F $1;shift;done`";((P2))&&{ c="sudo $c";P2=;};v=`eval "$c"`;[[ "$v" ]];};A2() { local c="${c1[$1]}";[[ "$c" =~ ^(awk|sed ) ]]&&c="$c '${s[$2]}'"||c="$c ${c2[$2]}";shift 2;local d=` while [[ "$1" ]];do F $1;shift;done`;((P2))&&{ c="sudo $c";P2=;};local a;v=` while read a;do eval "$c '$a' $d";done<<<"$v";`;[[ "$v" ]];};A3(){ v=$((`date +%s`-v[3]));};export -f A1 A2 F;B1() { v=No;! ((v[1]))&&{ v=;P1=1;};};eval "`type -a B1|sed '1d;s/1/2/'`";B3(){ v[$1]="$v";};B4() { local i=$1;local j=$2;shift 2;local c="cat` while [[ "$1" ]];do F $1;shift;done`";v[j]=`eval "{ $c;}"<<<"${v[i]}"`;};B5(){ v="${v[$1]}"$'\n'"${v[$2]}";};B6() { v=` paste -d$'\e' <(printf "${v[$1]}") <(printf "${v[$2]}")|awk -F$'\e' ' {printf("'"${f[$3]}"'",$1,$2)} ' `;};B7(){ v=`egrep -v "${v[$1]}"<<<"$v"|sort`;};eval "`type -a B7|sed '1d;s/7/8/;s/-v //'`";C0() { [[ "$v" ]]&&sed -E "$s"<<<"$v";};C1() { [[ "$v" ]]&&printf "${f[$1]}" "${l[$2]}" "$v"|sed -E "$s";};C2() { v=`echo $v`;[[ "$v" != 0 ]]&&C1 0 $1;};C3() { B4 0 0 63&&C1 1 $1;};C4() { echo $'\t'"Part $((++P)) of $Q done at $((`date +%s`-v[3])) sec">&4;};C5() { sudo -k;pbcopy<<<"$o";printf '\n\tThe test results are on the Clipboard.\n\n\tPlease close this window.\n';exit 2>&-;};for i in 1 2;do eval D$((i-1))'() { A'$i' $@;C0;};';for j in 2 3;do eval D$((i+2*j-3))'() { local x=$1;shift;A'$i' $@;C'$j' $x;};';done;done;trap C5 2;o=$({ A0;D0 0 N1+1 2;D0 0 $N1 1;B1;C2 31;B1&&! B2&&C2 32;D2 22 15 63;D0 0 N1+2 3;D0 0 N1+15 17;D4 3 0 N1+3 4;D4 4 0 N1+4 5;D4 N3+4 0 N1+9 59;D0 0 N1+16 99;for i in 0 1 2;do D4 N3+i 0 N1+5+i 6;done;D4 N3+3 0 N1+8 71;D4 62 1 10 7;D4 10 1 11 8;B2&&D4 18 19 53 67;D2 11 2 12 9;D2 12 3 13 10;D2 13 32 70 101 25;D2 71 6 76 13;D2 45 20 52 66;A1 7 77 14;B3 28;A1 20 31 111;B6 0 28 5;B4 0 0 110;C2 66;D4 70 8 15 38;D0 9 16 16 77 45;C4;B2&&D0 35 49 61 75 76 78 45;B2&&{ D0 28 17 45;C4;};B2&&{ A1 43 85 117;B3 29;B4 0 0 119 76 81 45;C0;B4 29 0 118 119 76 82 45;C0;    };D0 12 40 54 16 79 45;D0 12 39 54 16 80 45;D4 74 25 77 15&&{ B4 0 8 103;B4 8 0;A2 18 74;B6 8 0 3;C3 75;};B2&&D4 19 21 0;B2&&D4 40 10 42;D2 2 0 N1+19 46 84;D2 44 34 43 53;D2 59 22 20 32;D2 33 0 N1+14 51;for i in {0..2};do A1 29 35+i 104+i;B3 25+i;done;B6 25 27 5;B6 0 26 5;B4 0 0 110;C2 69;D2 34 21 28 35;D4 35 27 29 36;A1 40 59 120;B3 18;A1 33 60 121;B8 18;B4 0 19 83;A1 27 32 39&&{ B3 20;B4 19 0;A2 33 33 40;B3 21;B6 20 21 3;};C2 36;D4 50 38 5 68;B4 19 0;D5 37 33 34 42;B2&&D4 46 35 45 55;D4 38 0 N1+20 43;B2&&D4 58 4 65 76 91;D4 63 4 19 44 75 95 12;B1&&{ D4 53 5 55 75 69&&D4 51 6 58 31;D4 56 5 56 97 75 98&&D0 0 N1+7 99;D2 55 5 27 84;D4 61 5 54 75 70;D4 14 5 14 96;D4 15 5 72 96;D4 17 5 78 96;C4;};D4 16 5 73 96;A1 13 44 74 18;C4;B3 4;B4 4 0 85;A2 14 61 89;B4 0 5 19 102;A1 17 41 50;B7 5;C3 8;B4 4 0 88;A2 14 24 89;C4;B4 0 6 19 102;B4 4 0 86;A2 14 61 89;B4 0 7 19 102;B5 6 7;B4 0 11 73 102;A1 42 86 114;j=$?;for i in 0 1 2;do ((! j))||((i))||B2&&A1 18 $((79+i-(i+53)*j)) 107+8*j 94 74||continue;((PIPESTATUS))&&break;B7 11;B4 0 0 11;C3 $((23+i*(1+i+2*j)));D4 $((24+i*(1+i+2*j))) 18-4*j 82+i-16*j $((112+((3-i)*i-40*j)/2));done;D4 60 4 21 24;D4 42 14 1 62;D4 43 37 2 90 48;D4 41 10 42;D2 48 36 47 25;A1 4 3 60&&{ B3 9;A2 14 61;B4 0 10 21;B4 9 0;A2 14 62;B4 0 0 21;B6 0 10 4;C3 5;};D4 9 41 69 100;D2 72 21 68 35;D2 49 21 48 49;B4 4 22 57 102;A1 21 46 56 74;B7 22;B4 0 0 58;C3 47;D4 54 5 7 75 76 69;D4 52 5 8 75 76 69;D4 57 4 64 76 91;D2 0 4 4 84;D2 1 4 51 84;D4 21 22 9 37;D0 0 N1+17 108;D4 76 24 88;A1 23 18 28 89;B4 0 16 22 102;A1 16 25 33;B7 16;B4 0 0 34;D1 31 47;D4 64 4 71 41;D4 65 5 87 116 74;C4;B4 4 12 26 89 23 102;for i in {0..3};do A1 0 N1+10+i 72 74;B7 12;B4 0 0 52;C3 N3+5+i;((i))||C4;done;A1 24 22 29;B7 12;B3 14;A2 39 57 30;B3 15;B6 14 15 4;C3 67;A1 24 75 74;B4 1 1 122||B7 12;B3 23;A2 39 57 30;B3 24;B6 23 24 4;C3 68;B4 4 13 27 89 65;A1 24 23;B7 13;C3 73;B4 4 0 87;A2 14 61 89 20;B4 0 17;A1 26 50 64;B7 17;C3 6;D0 0 N1+18 109;D4 7 11 6;A3;C2 39;C4;} 4>&2 2>/dev/null;);C5
Copy the selected text to the Clipboard by pressing the key combination command-C.
8. Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
Click anywhere in the Terminal window and paste by pressing command-V. The text you pasted should vanish immediately. If it doesn't, press the return key.
9. If you see an error message in the Terminal window such as "Syntax error" or "Event not found," enter
exec bash
and press return. Then paste the script again.
10. If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. If you don't know the password, or if you prefer not to enter it, just press return three times at the password prompt. Again, the script will still run.
If you're not logged in as an administrator, you won't be prompted for a password. The test will still run. It just won't do anything that requires administrator privileges.
11. The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. While it's running, a series of lines will appear in the Terminal window like this:
[Process started]
        Part 1 of 8 done at … sec
        Part 8 of 8 done at … sec
        The test results are on the Clipboard.
        Please close this window.
[Process completed]
The intervals between parts won't be exactly equal, but they give a rough indication of progress. The total number of parts may be different from what's shown here.
Wait for the final message "Process completed" to appear. If you don't see it within about ten minutes, the test probably won't complete in a reasonable time. In that case, press the key combination control-C or command-period to stop it and go to the next step. You'll have incomplete results, but still something.
12. When the test is complete, or if you stopped it because it was taking too long, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.
At the top of the results, there will be a line that begins with the words "Start time." If you don't see that, but instead see a mass of gibberish, you didn't wait for the "Process completed" message to appear in the Terminal window. Please wait for it and try again.
If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.
13. When you post the results, you might see an error message on the web page: "You have included content in your post that is not permitted," or "You are not authorized to post." That's a bug in the forum software. Please post the test results on Pastebin, then post a link here to the page you created.
14. This is a public forum, and others may give you advice based on the results of the test. They speak for themselves, not for me. The test itself is harmless, but whatever else you're told to do may not be. For others who choose to run it, I don't recommend that you post the test results on this website unless I asked you to.
Copyright © 2014, 2015 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

No startup sound (I constantly need to restart PRAM)

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