IMac freezes after OSX 10.9.1 upgrade

I have a 27in iMac running OSX 10.9.1 Mavericks and Safari 7.0.1. Sometimes Safari freezes and sometimes whole computer freezes. Able to move mouse pointer around but unable to click on anything.

Please tell me that Apple is not en route to being the new Microsoft which I so happily escaped a few years ago. My computer is doing the exact same thing. It went years without freezing, but since upgrading to OS 10.9.1 a couple of weeks ago and the lastest version of Safari, my iMac 27 can be counted on to freeze at least daily. As with your situation Bill, the only thing that is active is my mouse pointer, but that does nothing in that you can point till you turn blue because nothing esle on the computer is alive. I clean my caches, I reset Safari, and keep my computer clean and orgainized. It has frustratingly happened twice today. I have 12 gigs of RAM so thst certainly is not an issue. Come on Apple, get off your *** and deal with this issue. I'll accept the fact that I can't crop a photo in iPHoto since paying for an upgrade to that piece of crap! BTW, I can't help but distressingly note that your original complaint was registered at least 3 weeks ago and apparently nothing has been resolved. Perhaps Apple is recruiting personnel from Microsoft.
Sandy Scott

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I own a late 2009 Macbook Pro, and it keeps freezing after OSX Lion installation.

I own a late 2009 Macbook Pro, and it keeps freezing after OSX Lion installation. I will post my computer's 'specs' below. I installed Lion, from Snow Leopard, through the App store. The first week, it worked like a dream, and was loving my brand new computer, or so it seemed. I then began to run into problems, and I can't confirm this 100%, but I believe it was after I updated from 10.7.1, to 10.7.2.
The freezes are sporatic at best, and cannot be narrowed down to one app. I googled the issue about two weeks ago, and found a fix involving a temporary log-in, verifying the disk, restarting the computer holding CMD+R, and repairing the disk from there. That fixed the problem. For about three or four days. From there I brought my laptop to Best Buy, where I purchased the computer (start the groans, my dad wanted the accidental damage, and he was paying, there was no argument). My warranty there was still good, but all they were offering was to check my hard-drive, and possibly ship it out. That would not be good for me, as I am a High School student, who works online.
So I then decided to go to the Apple store, see what they said. They said a bunch of people had this problem, it would cost a lot to fix, as I would need a new Logic Board. This did not make any sense to me, as I knew it was Lion's fault, so why would they not make the L-2009MBP Logic Board compatible, and why are only a few people having this problem, well a lot more than a few, but I mean not everyone.
So I asked a friend about it, and we decided to run a back up, and erase the computer, and re-install Lion. Figuring maybe my data was corrupted during install. This helped for a day or two, and happened again. So this time, we backed up only files (music, pics, documents, etc.,) and did a fresh install. I got my computer back last night. Now, I am not saying that didn't help. Previously I would have frozen about 18 times well writing this, but I have not frozen once (hopefully I didn't just jinx myself). I have gone from about one freeze every 10-15 minutes (sometimes worse), to about one every 1-3 hours. Which, let's be honest is still a lot.
So, before I just decide to go and revert to Snow Leopard on my merry way, I ask, do any of you have any other ideas? Or guarenteed fixes? I know a guarentee is a hard thing to ask for, but I am desperate, my teachers are getting angry with me for not sending work, and I know this would help a lot of people. Thank you to those who read through my whole spiel, and thank you to those who will help me!
[Ps, while I am somewhat of a noob, I know my way around a computer, so any help, or knowledge you could bestow upon me is awesome. Especially DIY fixes. (if your only advice is, don't buy a mac at Best Buy, don't bother commenting)]
Macbook Pro
15-inch, 2.53GHz, Mid 2009
Processor: 2.53 GHz Intel Core 2 Duo
Memory: 4 GB 1067 MHz DDR3
Graphics: NVIDIA GeForce 9400M 256 MB
Software: Mac OS X Lion 10.7.2 (11C74)

Once it is downloaded you need to restart the computer if it does not restart automatically. When it next starts up you should note a progress bar appearing below the Apple logo. When done the computer will restart once more. The new firmware should now be installed.

My imac freezes after 5 minutes of use

my imac freezes after 5 minutes of use, that's including after i reboot. is there something that i'm not doning because it's freezing on all my programs.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

Imac freezes after sleep

Just 4 days ago, I noticed that my iMac freezes after sleep, I haven't added or altered any programs nor downloaded any new software.
System was working perfectly prior to this.
Any ideas? My iMac is a 21.5 inches, 3.06 GHz Intel 2Duo, 4GB 1067 MHz DDR3, 500GB HDD
Thanks

Just 4 days ago, I noticed that my iMac freezes after sleep, I haven't added or altered any programs nor downloaded any new software.
System was working perfectly prior to this.
Any ideas? My iMac is a 21.5 inches, 3.06 GHz Intel 2Duo, 4GB 1067 MHz DDR3, 500GB HDD
Thanks

My iMac freezes after installation of Mavericks

My iMac set. with the new Mavericks has started freezing, or going into sleep mode, and will not wake up. I have to hold the power button in for about ten seconds to force it to close down, wait a few seconds, the press power button again and it will boot normally.
It will sometimes just freeze the screen, and other times go to a blank screen. Nothing will wake it up.
<Personal Information Edited by Host>

I have had consistent freezes after my MBP (15 in 2.4/2.2 GHz) goes to sleep since I installed Mavericks. When it's frozen, the fan is going hard, but nothing will wake it up -- not mouse motion, key presses (including "force quit" chord), closing and opening lid, etc. I have to force a shutdown with the power button, and restart it.
The only thing I've found to prevent the freeze is to prevent going to sleep. There's nothing that I recognize as suspicious in the console log. I've reinstalled Mavericks, I've fixed permissions, I've repaired the hard drive, I've removed plugins. I don't know what else to try. So I'm looking for suggestions, please!

My Imac freezes after...

After being in sleep mode, my Imac freezes whenever I try to play internet-based video. It is the newest model and I've had it for about 6 weeks. It is realy frustrating!

You have 90 days Free Telephone Support... (3 Years if you Purchased AppleCare).
Give AppleCare a call and ask for assistance...

IMac freezes after a few seconds

Hi everyone,
my iMac freezes right after starting up. the clock and the time of internet connection keeps on counting. but the (wired) mighty mouse and keyboard get no power I think. plus the bluetooth symbol is crossed out, although bluetooth is disabled... cannot start repair or system, because it freezes after just a few seconds everytime I start up. anyone any idea.
thanks,
alex
iMac G5 1,8 GHz, 512 RAM

Hi Alex,
Try disconnecting everything from the Mac including power supply, give it a few seconds, while waiting unplug keyboard and plug into different USB PORT, now re-connect power supply and turn on machine... see if you can get your Mac to boot up properly... here's a link explaining the procedure: http://docs.info.apple.com/article.html?artnum=301733
Rick
iMac G5 iSight 20" - 30G iPOD in Slimming Black - Mac OS X (10.4.7) - HP Pav 15" WS and Toshiba Sat 17" WS LP's - Canon 20D & A620

IMac freezing after update to Yosemite

Hi reader!
I'm struggling with my iMac after I've updated to Yosemite.
Problem description:
My iMac keeps crashing when I launch some specific demanding programs.
I tried to launch a game, Heroes of Newerth, it keeps freezing the iMac totally, after 10-15 sec.
When i launch videos on Facebook it does the same.
I can play movies in VLC and i can surf on the internet, but not watch youtube videos.
I’ve tried deleting apps like Adobe and Java, but can’t seem to delete Java to reinstall it.
These apps are being reinstalled as I write this.
The real issue is, it happened suddenly after some weeks after I updated to Yosemite, and i haven't updated anything else the last 2-3 days.
I am really in a pickle, with exam-reading coming up, and I have a lot of stuff backed up on a USB drive, but not it all.
I can't even get diskwarrior before it freezes up.
My specs are
iMac 24-inch, early 2009
Processor 2,93 GHz Intel core 2 duo
Memory 4 gb 1067 MHz DDR3
Graphics ATI Radeon HD 4850 512 MB
If more is needed, I'll be happy to provide it.
Thanks, appreciate the help!

The Etrecheck report:
Problem description:
My iMac keeps crashing when a launch some specific demanding programs.
I tried to launch a game Heroes of Newerth, it keeps freezing the iMac totally, after 10-15 sec.
When i launch videos on Facebook it does the same.
I can play movies in VLC and i can surf on the internet, but not watch youtube videos.
I’ve tried deleting apps like Adobe and Java, but can’t seem to delete Java to reinstall it.
EtreCheck version: 2.0.11 (98)
Report generated 19 Nov 2014 12:35:23 CET
Hardware Information: ℹ️
    iMac (24-inch, Early 2009) (Verified)
    iMac - model: iMac9,1
    1 2.93 GHz Intel Core 2 Duo CPU: 2-core
    4 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1067 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1067 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
    ATI Radeon HD 4850 - VRAM: 512 MB
        iMac 1920 x 1200
System Software: ℹ️
    OS X 10.10 (14A389) - Uptime: 0:13:24
Disk Information: ℹ️
    WDC WD6400AAKS-40H2B0 disk0 : (640,14 GB)
    S.M.A.R.T. Status: Verified
        EFI (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / [Startup]: 639.28 GB (232.15 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
    OPTIARC DVD RW AD-5670S
USB Information: ℹ️
    Apple, Inc. Keyboard Hub
        Apple Inc. Apple Keyboard
    Apple Inc. Built-in iSight
    Apple Inc. BRCM2046 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
    Razer Razer Abyssus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Problem System Launch Daemons: ℹ️
    [failed]    com.apple.ucupdate.plist
    [failed]    com.apple.watchdogd.plist
Launch Agents: ℹ️
    [not loaded]    com.oracle.java.Java-Updater.plist Support
Launch Daemons: ℹ️
    [not loaded]    com.adobe.fpsaud.plist Support
    [not loaded]    com.macpaw.CleanMyMac2.Agent.plist Support
    [not loaded]    com.microsoft.office.licensing.helper.plist Support
    [not loaded]    com.oracle.java.Helper-Tool.plist Support
    [not loaded]    com.oracle.java.JavaUpdateHelper.plist Support
    [not loaded]    com.zeobit.MacKeeper.plugin.AntiTheft.daemon.plist Support
User Launch Agents: ℹ️
    [invalid?]    com.adobe.ARM.[...].plist Support
    [not loaded]    com.facebook.videochat.[redacted].plist Support
    [not loaded]    com.macpaw.CleanMyMac2Helper.scheduledScan.plist Support
    [not loaded]    com.macpaw.CleanMyMac2Helper.trashWatcher.plist Support
    [not loaded]    com.spotify.webhelper.plist Support
    [not loaded]    com.valvesoftware.steamclean.plist Support
User Login Items: ℹ️
    iTunesHelper    ApplicationHidden (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins: ℹ️
    Flip4Mac WMV Plugin: Version: 3.2.0.16   - SDK 10.8 Support
    FlashPlayer-10.6: Version: 14.0.0.145 - SDK 10.6 Support
    Default Browser: Version: 600 - SDK 10.10
    AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
    AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
    Flash Player: Version: 14.0.0.145 - SDK 10.6 Mismatch! Adobe recommends 15.0.0.223
    QuickTime Plugin: Version: 7.7.3
    SharePointBrowserPlugin: Version: 14.4.5 - SDK 10.6 Support
    Silverlight: Version: 5.1.20913.0 - SDK 10.6 Support
    JavaAppletPlugin: Version: Java 8 Update 25 Check version
3rd Party Preference Panes: ℹ️
    Flash Player Support
    Flip4Mac WMV Support
    Java Support
Time Machine: ℹ️
    Time Machine not configured!
Top Processes by CPU: ℹ️
        87%    plugin-container
        29%    firefox
        24%    System Preferences
        11%    WindowServer
         0%    fontd
Top Processes by Memory: ℹ️
    527 MB    firefox
    125 MB    Finder
    95 MB    WindowServer
    86 MB    plugin-container
    77 MB    CalendarAgent
Virtual Memory Information: ℹ️
    404 MB    Free RAM
    1.95 GB    Active RAM
    1.56 GB    Inactive RAM
    383 MB    Wired RAM
    877 MB    Page-ins
    25 KB    Page-outs

Macbookpro does not connect to wireless after osx 10.7.4 upgrade

My MBP has stopped recognising my wireless connections post THE OSX 10.7.4 upgrade. It detects the modem and asks for password, but Does not accept, nor connect.
But strangely enough, if I sit next to the modem, the Mbp connects easily.
My other Apple products connect to the same modem without issue.
Have tried all basic checks both with the modem and also the mbp...but no Solutions so far.
Anyone else with à similar issue?...Amy help Will be welkome
Regards
M

This is only the site for Toshiba USA, so I don't have any information on your model. If you were using a US unit, I would recommend this article:
Troubleshooting Wi-Fi (Wireless) Problems
You may want to check the Toshiba Europe forums.
- Peter

No sound after OSX 10.6.8 upgrade

No sound after OSX 10.6.8 upgrade

Go step by step and test.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers / Headphones
    Make sure that Mute is not enabled.
2.Plug in and remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
3. Reset PRAM. http://support.apple.com/kb/PH4405
4. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
5. Applications > Utilities > Audio MIDI Setup
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IMac freezes after downloading Macromedia Flash and Shockwave

I just got my iMac less than a month ago. It ran fine until I downloaded the latest versions of Macromedia Flash and Shockwave in order to view certain websites. Since then, my iMac freezes about once a day. How do I uninstall Flash and Shockwave to determine if they are the cause of the freezes?
iMac 20" 2.16GHz Intel Core 2 Duo Mac OS X (10.4.9) 128MB VRAM, 2GB 667 DDR2 SDRAM - 2x1GB

I have a gut feeling it's Shockwave that is causing the freezes. If you aren't familiar with Spotlight yet, it's the icon with a blue circle top right in your Menu. Click the Spotlight icon, in the Search field type in Shockwave. That will give you a list of where the Shockwave folders are and the components. Drag the Shockwave files to the Trash and empty the Trash.
As far as Flash is concerned, I've been using Macromedia's Flash with Safari for years without a glitch, but that's just my experience. If it were me, I'd trash Shockwave and see how your iMac behaves before I did anything about Flash
Also, there's a great disk utility that can help keep your iMac running stable and it's free. Here's where you can get it: http://www.apple.com/downloads/macosx/systemdiskutilities/onyx.html Download and install. Run the Maintenance and Cleaning scripts... once a week!
Carolyn

IMac freezing after startup

My 2010 iMac freezes every time I boot it up. I have completely erased the hard drive and started fresh with Snow Leopard, repaired the disk/disk permissions, booted in safe mode, reset the PRAM...I've tried everything to no avail. Within 30 seconds-2 minutes of startup, the spinning beach ball appears and I can't do anything. I guess it's not actually "frozen," as I can still move the mouse and click on things, but they won't actually open. Example: I can click on the apple menu and click about this mac, but it won't open the window. I have been trying to download the Snow Leopard update so that I can install Mavericks to see if that will help, but either the software check stalls or the download stalls within minutes of starting. Any ideas?!

Just to rule out hardware issues, run the AHT.
See: Using Apple Hardware Test on computers with OS X 10.5.5 to 10.6.8 > Apple Hardware Test

IMac freezing after Mountain Lion Upgrade

After upgrading my iMac to Mountain Lion it is freezing at least one a day. Sometimes the screen get messed up right before getting frozen, something like this video (from another guy), but they move from top to bottom to me.
I never had this problem before, it started right after the Mountain Lion upgrade.
Anyone with the same problem? Any ideas?

Permissions Repair:
Go to applications then to the "other" folder then go to disk utility, on the left hand side you will see a white box. Select the second option, usually called "mac HD" with that selected click on "repair permissions" in the center towards the bottom of the screen. Wait for it to complete, then see if this fixes the issue.
PRAM Reset:
1- Ensure the machine is powered off.
2- Locate the following keys on your keyboard in preparation for Step 4:
‘command’ – ‘option’ – ‘P’ – ‘R’
3- Press the ‘power on’ button.
4- Immediately – and before the grey screen appears – hold down ‘command-option-P-R’ all together.
5- Keep them held down until you’ve heard the start-up chime twice. After you release them you should hear it again, and hopefully your Mac will boot up normally

IMac - gray screen after OSX 10.9.4 upgrade

iMAC
21.5-inch, Late 2009
Processor 3.33 GHz Intel Core 2 Duo
Memory 16 GB 1067 MHz DDR3
Graphics ATI Radeon HD 4670 256 MB
Software OS X 10.9.4 (13E28)
After being gone for 2 weeks we returned home and initially the iMAC booted fine and my wife was able to use it with no issues. Then she called later in the day reporting that she could no longer log into the machine despite trying to restart and then powering off/on. I had auto updates turned on so my guess is that the update to 10.9.4 happened but failed to complete.
I rebooted using the recovery disc, ran the check disk utility and there were some issues with permissions on some of the printer related files. After the utility corrected those I attempted to reboot again. Still ended up with the gray screen.
I installed OSX again, received no error messages, but still gray screen again. Rebooted in safe mode, checked the disks again and no issues. I followed all the steps to in the knowledge base article to check peripherals (none connected), clear memory, reinstall, etc. Getting the machine back in working mode required erasing the main drive and reinstalling OS X again. Since I have a cloud backup of my data, I was able to do that without serious data loss. It seems there was some issue with the update conflicting with some data that existed on the drive. Don't know where that would have been logged and not enough time available for me to scour the support site to track it down. This is mainly an FYI that the 10.9.4 updater may have issues and it took some drastic measures on my part to get my machine working again.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

IMac freezes after lion upgrade

Upgraded imac from SL to lion, and now the computer freezes when waking from sleep or switching accounts. I have no issues during the process of using the computer. I have installed new RAM (4gigs), reinstalled the OS, erased the HD (securely) and rebuilt from back-up, pram, disk utilities, disk warrior. Read in one post that this may be the logic board and that Apple may be replacing these in certain modles. I never had the computer freeze when I was running SL, and I am a school IT guy with over 100 macs running SL and this does not happen at school. I have heard from others of the same thing once they go to Lion but the Apple Store says they have not heard of it! Do not see how this could be a hardware thing since it looks to happen after Lion upgrade.
Any ideas

I did do the above as I read that may work too, I also made it so the HD never sleeps. Did not help for me, computer still freezes when switching accounts, not all the time, on average every other day I need to do a hard restart.
Still looking for the answer

IMac freezes after OSX 10.9.1 upgrade

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