IMac G5 PowerMac wont boot up

When I try to boot up iMac G5 PowerMac, it turns on the sleep light, no screen and then all of the fans get into turbo mode. Please help!!

Is the light blinking in a pattern?
Fans will come on full speed if no OS is loaded to control them.
Can you count the beeps or flashes?
1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
5 beeps = processor is not usable
In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.
Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.
http://support.apple.com/kb/HT1547
Does anything show on screen if you hold alt key at bootup?

Similar Messages

IMac black screen, wont boot, no chimes

Hi,
I have an intel iMac 2010 model 21.5 inch screen.
Snow leopard
All up to date with software updates
4GB ram
500GB HDD
I tend to always leave it in sleep at my office and when an update is available I do a reboot.
After a few days away from the office I can no longer do anything with the iMac?
Pressing the keyboard doesn't wake it up.
So I booted it down and rebooted.
I hear a faint sound of a beep (But not the chimes) then I hear the HDD crackle away and the fans come on.
There are no chimes and the screen stays completely off.
Things I have tried:
Holding down shift on reboot
Holding down cmnd option P and R on reboot ( I have tried all the keyboard options that I have read about)
Holding down C on boot with the OSX disc inserted (I hear a series of beeps during this time, but nothing happens)
I have taken out the RAM and reset it, but to no avail
I have booted down, removed the cable, waited 15 seconds and then re inserted it and rebooted
Nothing seems to do anything.
I cannot afford to have it repaired by apple and would consider repairing it myself, if only I knew what was wrong with it?
If you have any idea's as to whether its the power supply or logic board or something simple, i would be keen to know so i can look at repairing it.
I have taken my macbook pro apart numerous times to replace fans, HDD, RAM etc (but te iMac does look a wee bit more complex than that)
EDIT: I have plugged in my iphone to a usb socket and it charges, so i assume the power is actually there, its just not booting??
I have no warranty on this either
Best regards
Chris

Hi BDAqua
My friend brought his MBP round and we connected the two via firewire and booted using the 'T' option on KB but it showed nothing.
I have an inkling it may be a power supply rather than logicboard. At least I hope so as the price difference between the two is crazy.
The DVD drive spins but nothing happens/
I have even tried to look at any LED lights in the RAM port but cannot see anything?
I just hope it can be resolved at a reasonable price
Regards
Chris

Imac late 2013 wont boot

Imac loads to grey apple logo and then just continues to spin instead of loading.
Previous to this i went back to my imac one night few weeks back and when i turned it on it came up with grey apple logo and a loading bar across the bottom. When in started to load it just turned itself off.
I managed to access the disk utility which come up saying drive couldnt be repaired. ended up erasing HDD and reinstalling OS. ever since this its never run like it should and now waking up this morning to this.
Can anyone help?
thanks

Follow the steps listed in this article
Mac OS X: Gray screen appears during startup

Imac wont boot after long time without restart

Hi
I've got a two month old new Imac 21,5" with fusion drive 1TB, i had it just before mavericks was launched..
i update to mavericks. All was fine, But i allmost never shut down, or restart the imac.
After some time, I did for a reason i dont remember, had to restart the imac. while booting, it was stuck on the grey screen.. i wasn't able to get it started up, not in safe mode, not after disk repair.. i think i might have tried all the little tricks to get it running again...
luckily i did have a time machine back up...
after installing this back up, everything was fine again..
until 2 weeks later, for some reason i had to reboot again.. and again, it was stuck.. only thing to get the imac working again.. reinstall from time machine back up
after this , it tried rebooting everyday, and the imac kept working..
after a few days, i forgot to reboot for a few days.. and what did you think.. the imac is stuk again.. so while reinstalling the time machine back up. I am writing this. anyone else having this rather strange problem.. if i restart the imac now and then i keeps working.. if i dont after a few days, and i do reboot the imac.. is wont boot anymore..
Any suggestions are welcome
greetings

The long tone is an indication that a firmware update is installing. Do you get a progress bar at the bottom of you screen after letting the power button go?
Have you reset the PRAM? (cmdalt+PR when you restart the machine)
Also repair permissions when the machine is up and running.

24" iMac - Wont boot from HD or disc... Help!

Hi guys,
Just been working on iMac, forget the exact spec but it's a 24" Intel 2.something Core 2 Duo or whatever it is, 4gb DDR2 RAM, gotta be about 2 years old to the day and after my last 2 Macs have lasted forever, never developing a fault, I didn't take out Applecare... Perhaps I had a bit too much faith...
As I say, just working away and all of a sudden, upon putting a video in Quicktime to full screen, the whole image has kinda of condensed itself into the top 20% of the screen and started slightly flickering the image. I've tried quitting some of the programmes, but neither the mouse nor leyboard have been responding so I've just had to turn the computer off.
I've gone to turn it back on, and after about 30 seconds, it's got as far as the grey screen but then the little spinning progress indicator pauses and it does nothing else.
I've reset the PRAM and that made it take longer before it froze but ultimately did nothing.
I've now tried getting it to boot from the Snow Leopard disc but this does the something, until after about 3 - 5 minutes, the screen goes all pshychedlic, like looking at an old school TV really close...
So looking for any suggestions on other things to try before I have to take to my local store... Any hazard a guess at what may be up with it?
I've got a back up the whole computer but I don't think this is a software problem, I'm assuming it's going to be a hardware one?
Any help at all would be much appreciated!

Ok, tried Safe Mode and that wont boot either. Saw a little progress bar on the grey screen though which made a change, but ultimately, it crashed once that had disappeared.
I've just noticed that at the point when the progress wheel stops spinning, a pattern of dead pixels appears across the screen that aren't there when the progress wheel is spinning.
The more I talk to people about this, the more graphics card seems to come back as the likely culprit, based on the fact that:
- it started by me putting a video to full screen
- the fact the display went weird when it first happened and also it plays up after it crashes with the psychedelic colours
- it wont boot from HD, disc or now in safe mode either, however it does run AHT fine.
- I've hoovered out the vents on the iMac and somehow it seems slower than it was before (bit odd)
- the dead pixel thing mentioned above
So now thinking it may be time to get a new graphics card?
Reckon this is likely, even though the AHT hasn't picked up any problems? As mentioned earlier, I'm not too concerned about it would seem it doesn't particularly test the graphics card too much, so all just seems to point towards it.
Anything else that I could do to single this out as the likely culprit?
Guess this is a chance to upgrade!

I have a Imac 8,1 That wont boot.

I have a Imac 8,1 that wont boot.
3.06Ghz, Nvidia 8800
I believe i have 2 problems.
First this is what ive already done:
I ran an extensive hardware test, no problem
In disk utility I erased my harddrive and clean installed Mavericks,
Verified and repaired disk, no problems
Verified and repaired permissions, no problems
Disk boots up fine when running on MacBookPro through Firewire
Zapped PRAM/NVRAM plenty
After upgrade I can no longer boot into safe mode, Stalls after 25%
Can no longer use CMD-R
Can no longer use Apple Hardware Test
Doesnt seem like I can update firmware from disk by holding down the power button. not sure im using the right disk either.
These problems probably stem from running complex graphics on a windows 7 partitions I used to have.
     First off I think my GPU is out. I get Thick Green lines down the screen that are not from screen damage straight from startup.
After Chime the apple logo pops up and loads but after a while the wheel stops and the computer will reboot moments after. Im hoping this is a Firmware problem and I dont have to replace my GPU. My computer has booted up with the lines before and I dont think its the cause for not booting but im no professional. Before I updated to Mavericks This Problem already existed. Can a failing GPU cause boots to fail?
     During hardware test the green lines would go away and I would have a clean screen.
I loaded Mavericks from a USB drive from there onto the newly erased harddrive (32 Write erase). Everything was going great until I got close to the end of the loading bar for the setup and it froze. The colors on my screen displayed everything but with the colors messed up into a rainbow oval on the top half of the screen. I rebooted and suddenly I cant boot from anything. Harddrive, Install Disk, or USB
     So I plugged up my firewire and got on a MacBookPro with Mavericks and erased the disk again. Then I installed Mavericks flawlessly and it will boot from the MacBookPro but not from the Imac.
When I boot in Verbose mode I get an error that says
BootCacheControl: Unable to open /var/db/BootCache.playlist:2 no such file or directory
Then
NVDAStartup: Official (im guessing thats my GPU)
and a bunch of SMC:smcReadKeyAction ERRORS
and Sandbox: authd(##) deny file-write & deny file-read errors
Im thinking I need a new GPU but I want to be absolutely certain before I spend anything on replacing parts.
Could this be a EFI Firmware Problem?
like a Firmware/boot data problem from a bad ESP (I dont know what is what really).
If all this is part of the GPU it would totally make sense to just go ahead and replace it if thats the case. But im no expert, What do you think?

Very simple take it to an Apple Store or AASP and have it professionally diagnosed. Anything else would be guessing. Do NOT spend a penny on it until it is professionaly diagnosed otherwise you stand and excellent chance of throwing good money after bad.

My iMac wont boot up properly. Stops at background pic, no dock, only little apple show up top and cursor sticks on little spinning wheel. Have to shut down manually in back and reboot to get it to work. Any ideas why this sometimes happens?

I'm running OSX 10.9.1 (13B42)
My problem is that occasionally my Mac wont boot properly. It gets to the background picture where the dock should open but it freezes there. The little apple shows up top left but nothing else and the cursor shows as the little spinning wheel that wont do anything. I can't click on the apple to restart, I have to switch off in back and then start up again. It usally boots all the way after that but I'm worried there's something up since this seems to be happeneing more frequently. Also I'm worried that having to manually shut down like that will somehow damage the software in time?
I tried a disk verify but there were no repairs needed. I repaired disk permissions too just in case but it still seems to happen every once in a while.
I've noticed recently that it happens the next reboot after I've been streaming movies online if that helps. Is there any reason for this and anything i can do to stop it in the future?

Thanks Paul, just ran the etrecheck you recommended and got this:
Hardware Information:
          iMac (21.5-inch, Mid 2011)
          iMac - model: iMac12,1
          1 2.5 GHz Intel Core i5 CPU: 4 cores
          4 GB RAM
Video Information:
          AMD Radeon HD 6750M - VRAM: 512 MB
System Software:
          OS X 10.9.1 (13B42) - Uptime: 0 days 0:45:16
Disk Information:
          ST3500418AS disk0 : (500.11 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 499.25 GB (350.35 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          OPTIARC DVD RW AD-5690H
USB Information:
          Apple Inc. FaceTime HD Camera (Built-in)
          Samsung SCX-4600 Series
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Internal Memory Card Reader
          Apple Computer, Inc. IR Receiver
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Kernel Extensions:
          com.sophos.kext.sav          (8.0.14)
Startup Items:
          MobileBrServ: Path: /Library/StartupItems/MobileBrServ
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist 3rd-Party support link
          [loaded] com.adobe.SwitchBoard.plist 3rd-Party support link
          [loaded] com.anchorfree.ajaxserver.plist 3rd-Party support link
          [loaded] com.microsoft.office.licensing.helper.plist 3rd-Party support link
          [loaded] com.sophos.autoupdate.plist 3rd-Party support link
          [loaded] com.sophos.intercheck.plist 3rd-Party support link
          [loaded] com.sophos.notification.plist 3rd-Party support link
Launch Agents:
          [not loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
          [loaded] com.adobe.CS5ServiceManager.plist 3rd-Party support link
          [loaded] com.sophos.uiserver.plist 3rd-Party support link
User Launch Agents:
          [loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
          [failed] com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plist 3rd-Party support link
          [loaded] com.divx.agent.postinstall.plist 3rd-Party support link
          [loaded] com.google.keystone.agent.plist 3rd-Party support link
User Login Items:
          iTunesHelper
          BitTorrent
Internet Plug-ins:
          Flip4Mac WMV Plugin: Version: 2.4.4.2 3rd-Party support link
          FlashPlayer-10.6: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
          OVSHelper: Version: 1.1 3rd-Party support link
          Flash Player: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
          Default Browser: Version: 537 - SDK 10.9
          DivXBrowserPlugin: Version: 2.2 3rd-Party support link
          QuickTime Plugin: Version: 7.7.3
          SharePointBrowserPlugin: Version: 14.0.0 3rd-Party support link
          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Outdated! Update
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
3rd Party Preference Panes:
          DivX 3rd-Party support link
          Flash Player 3rd-Party support link
          Flip4Mac WMV 3rd-Party support link
          Growl 3rd-Party support link
Bad Fonts:
          None
Old Applications:
          /Library/Sophos Anti-Virus
                    SophosAntiVirus:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
                    SophosAutoUpdate:          Version: 8.0.15 - SDK 10.5 3rd-Party support link
                    SophosUIServer:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
                    InterCheck:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
          VLC:          Version: 2.0.1 - SDK 10.5 3rd-Party support link
          Sophos Anti-Virus:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
          Spotify:          Version: 0.8.4.93.gd9f49c35 - SDK 10.5 3rd-Party support link
          Install Spotify:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Users/[redacted]/Downloads/Programs/Install Spotify.app
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               2%          WindowServer
               2%          EtreCheck
               0%          Google Chrome
               0%          hidd
               0%          SophosUIServer
Top Processes by Memory:
          438 MB          firefox
          139 MB          InterCheck
          119 MB          com.apple.IconServicesAgent
          106 MB          Google Chrome
          78 MB          mds_stores
Virtual Memory Information:
          370 MB          Free RAM
          1.59 GB          Active RAM
          1.25 GB          Inactive RAM
          813 MB          Wired RAM
          397 MB          Page-ins
          0 B          Page-outs
I have no idea what all the means, lol.

IMac wont boot and has yellow squares at launch!!!

Ok, so Friday as I come home from buying Snow Leopard all excited because I also bought an DVI to HDMI cable to hook my 24 inch 3.06 10.5.8 iMac up to my TV. So as my laptop is upgrading to snow leopard I decide to hook up the TV. I plug the cables in and all is good. I went out and downloaded an app called TV Row.
http://www.macupdate.com/info.php/id/30081
It takes front row and puts it on an external monitor. Perfect, they have a brand new update out for snow leopard (which the iMac doesn't have yet) so i think its all good. But when I restart the computer it wont boot and I get a crazy boot screen with light yellow squares everywhere. It gets to the grey apple logo and the gear spins for about a minute and then locks up. I noticed that it was extremely hot!! I went and got a fan and put on the back of it but if i leave it running for about 15 minutes it will burn my hand. I have network access to it so im completely backed up and and down to start from scratch on it. Any ideas. Ill link a picture of what the yellow squares look like.
http://gallery.me.com/lmbvideography#100387/photo_1
Please Help!!!

If you put the Mac OS X Install DVD in the drive and restart your computer while holding down the Option key, and then click on the DVD when it appears on the screen, are you able to boot into the Installer? If so, can you try reinstalling Mac OS X (using the Archive and Install option) or perhaps restoring from a Time Machine backup?
If you're not even able to boot from the DVD, I'd suggest calling in an appointment and taking it to Apple right away before any significant damage is caused to the hardware.

Imac wont boot, stuck loading, all i see is apple logo and spinning cycle

My 27 inch iMac wont boot, i am runnign snow leopard. I just see the apple sign and the cycle spinning meaning its still loading. I cant use disk utility because leopard install disc wont boot, also i cant run any commands in single user mode, doing /sbin/fsck -fy does nothing, i dont see a # sign or anything, whatever i type it doesnt matter whenever i hit return the cursor just goes to the line below.

dudix wrote:
I cant use disk utility because leopard install disc wont boot
Power down (assume you have already tried the SMC reset) and insert the Applications DVD that came with your new iMac. Boot up while holding the "D" key down (may be best with a wired keyboard) to run the Apple Hardware Test according to these instructions:
http://support.apple.com/kb/HT1509

IMac wont boot up

My IMac wont boot up! I installed the Mac OSX system disk and ran disk utility this is the results:
invalid node structure
The volume Macintosh HD needs to be repaired.
Error: Filesystem verify or repair failed.
What do I do to get this up and running again, I would appreciate any help.
Thanks,
Joe

I called applecare and they were able to get my iMac up and running. Apparently there is an issue with updating software. I just had to do an update today and ended up with the same problem. So I re did what the applecare rep told me and I got it going again myself. I am hoping this will not continue. So anyway, I am going to provide the steps on how my I got iMac going.
1. unplug the computer for approx 17 seconds.
2. unplug everything from the computer except the mouse and keyboard.
3. plug in the computer
4. turn on the iMac and hold down the option key at the SAME TIME
5. when the iMac comes on, it will make a loud beep noise, CONTINUE to hold the power and option key until a small the Mac HD icon displays.
5. When the Mac HD icon shows on the screen, release the power button and option key. Then click on the arrow below the Mac HD icon.
5. The iMac will boot and take you to the desktop. Then click applications
6. choose the utility folder
7 then choose disk utility
8 a screen will appear that states first aid. At the bottom, there will be an option to repair disk. Click on that then choose Mac HD.
9 When this is finished, you are good to go. These steps will repair what ever the software updates are doing to the hard drive.
Hope this helps.

Imac wont boot

My late 2008 iMac wont boot. I have tried everything that i understand but cannot accesss harddisk.
I cannot boot fron dvd -cd or usb. I would like to run diskutil from terminal to repair and verify. System hangs/ stops running, when i try command+v ,message that (vmcl: Module initialized.)
Command + s puts me in single user mode and i cannot run diskutil.
Safe start is also not working.
I have all my work on imac and depserately need help.
Any ideas ???
Imac 2008 24" 3.06GHZ/2GB/500GB/SD8X/GF8800GS/512.
Downloaded and installed Lion recently, all software is ligitimate.
Running vmware / Vista, occasionally.
Machine just stopped, froze up.

Hei, just to let you know. I gave up and delivered my machine to mac repair. It turned out that a module error was the cause of my problems. They have since replaced the defective part and my machine works like a dream. No reinstalling either, all existing files and software are intact.

IMac wont boot from CD

I am selling my iMac so want to reformat the HD and do a fresh install of Leopard.
When I try to boot from the system CD I get the grey screen, I hear the CD Drive reading the disk, then the computer reboots. The same thing happens every time no matter how I try to boot from the CD. When I eject the CD, or boot from HDD, it loads the OS fine. It just wont boot from the CD.
I have tried:
Booting from CD by holding the C key during startup
Booting from CD using Startup Disk in System Preferences
Installing OS from the 'Install Mac OS X' application on the disc
Holding the option key during startup and selecting the CD drive
Resetting the NVRAM
Verifying the HD in disk utility
Verifying the CD in disk utility
Verifying and repairing HD disk permissions in disk utility
Running the install on my MacBook to check the CD (booted to the CD and started install process fine)
I have searched for previous discussions that reference this issue but could find none with this specific problem. The CD drive reads other media fine so I don't think it's a hardware issue.
Any help would be much appreciated.

Clean the disk?
Dirty lense?
The bottom of the disk must be free of scratches and especially human fingerprints which the oils can trasfer insdie the machine.
Use a bit of rubbing alcohol on a very soft clean cloth and polish ot a shine before using the optical drive.
Order a replacement disk from Apple, buy jewel cases that suspend your disk, the plasic/paper sleeves Apple provides aren't good.

IMac Wont Boot Question.I cant find an answer.

Ok Heres the story.
I have an iMac 20" display Intel Core Duo.
I came home yesterday and it was locked up.. I had to turn it off manually.
When it rebooted it started up but was stuck with a folder with a "?" on it.
I know it has to be the HDD.
I booted it from the snow leopard DVD and went into disk utlilty and repaired and verified the disk. The HDD shoes up in disk utility with the Macintosh Partition.After I repaired it it still does not appear as an option to st it as a start up disc.. I dont think the HDD is bad.. But I am not an expert
To be honest I dont care about the iMac I just want the data. I back up but I did not do one in a month or so and there are some things I want. If I removed the HDD and plugged into another mac would I be able to get the data off? I have one of those sata to USB adapters..
Any help would be appreciated let me know if you have any ideas

Do you know why it shows up in Disk Utilty but it wont boot from it?
Because the computer can't find a bootable OS on it. This is much more complicated than just seeing the drive.
(57561)

IMac G5 froze and now it wont boot? Help!

I have iMac G5, its 3 years old. I was playing a game and all of sudden it froze.
-First tried to resarted the computer, it wont boot up and there was no sound.
-Secondly, I manage to reboot, but it gave me the gray with Apple Logo and did not reach to the login screen.
-Thirdly, it booted up, though it was very sluggish and slow.
I manage to use Disk Utility, it seem to be fine. I shut down the computer it just froze.
I restarted the machine nothing, just a black screen. Only once I turn on with sound, still black screen and the FAN started to rev-up. I took out Ram from the machine and to see if I can restart it. I get power, No sound, and no gray screen. I have no clue what happen and how to fix it.
Any tips will be appreciated.
20 iMac G5 PPC 1.5GB Ram, OS 10.5.6
Thanks
Luis

Well, you could try booting from your install disc, and either running Apple Hardware Test, or using Disk Utility to try and repair the drive, but I still think it's the logic board:
1. Insert the Mac OS X Install disc that came with your computer, 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 if possible, reboot and run Permissions Repair from your hard drive.
Let me know if you manage to revive it.

Powermac G5 wont boot. Please help!!!

my PowerMac G5 wont boot, power suply or graphics card? When i press the power button is the chime and then after a while (fem minutes) the fans start revving up, all with a black screen........

See if it will come up into Open Firmware and let you do an NVRAM reset.
Hold the cmd-option-O-F key combination when powering. If the screen actually comes up, you should see a light background with black letters. To do the resed, enter the following three commands.
reset-nvram <enter>
set-defaults <enter>
reset-all <enter>
I don't have a lot of hope, in one sense, but it you get the OF terminal screen, then that says at least that at its basic guts, the machine is sort of working, and we can go from there. And, if it does make it into OF, the resets might actually clear things up.

IMac G5 PowerMac wont boot up

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