IMac randomly frozen at grey Apple logo screen.

Hi Guys,
I need your help.
My iMac randomly freezes at startup, at the grey Apple logo screen... some vertical black bars appears, the image is unclear and doubled. The round icon showing that the system is loading freezes. Some times, a black screen appears asking for the computer to be restarted.
I need to power off the iMac for 7-8 times and then it comes to normal till the next boot.
One time, a month ago, the same happened when I was already in leopard, but since then nothing. Now, in the last week, it's happening in 80% of the startups.
Any idea?
Thanks !!!
Andrei

1. Have you installed any third party RAM? If so try removing the third party RAM and install the Apple original RAM for testing.
2. Disconnect all external devices during testing. This means hard drives, ipods, printers, scanners, and hubs.
3. Boot to your install disk. Insert the install disk and hold down the "c" key at startup. Once it boots up select your language but instead of going through the install process go to the Utilities menu at the top select Disk Utility. Select your hard drive/Mac volume on the left then under the First Aid tab click Repair Disk. If that passes/repairs successfully Repair the Disk Permissions. Once this is finished go back to the Utilities menu, select Startup disk, choose your Mac OS X volume and click restart.
4. If you are still having issues insert your original gray iMac install disk, restart and hold down the "d" key. This will boot you to the Apple Hardware Test. Run the Extended test.
George

Similar Messages

  • My powerbook won't load past the grey apple logo screen

    I had been away on business for a few weeks and yesterday I decided to run the latest updates for my powerbook. In the middle of it the computer froze for what I think is the first time since I bought it 2 years ago. I ended up having to shut the computer down with the power button. When I turned it on it wouldn't and still won't advance past the grey apple logo screen with the progress indicator. It just sits there for hours on end if I let it.
    So far I've tried the following, all to no avail.
    Booting in safe mode I get the same result.
    Zapping the Ram
    Resetting the PMU
    Reinstalling OS X, during which the computer either randomly shuts down or goes to sleep and then shuts down and requires me to reset the PMU in order to start again.
    Running the hardware diagnosis. I did this once and it froze during the logic board test, 1 minute 6 seconds in to it.
    Anyone have any ideas that don't involve spending 900 dollars on a logic board? Thanks a lot for any help.

    joeuu, thanks for the reply. i checked the airport and the ram and both seem to be seated properly.
    i ran the quick hardware diagnosis and it came back showing everything was fine.
    when i ran the extended one i got more progress than i did the first time. it got to the RAM diagnosis (about 6:45 seconds in) and then froze - i let it sit like this for an hour and a half to make sure it was actually frozen.
    i also tried to run the disc utility from the installation disc and it just sits there with the progress wheel spinning, but nothing else is going on.

  • Why is my G5 is stopping on the grey+apple logo screen when starting up?

    My G5 is stopping on the grey+apple logo screen when starting up and fans run faster than usual after a couple minutes. I have read many of the posts related here, but it seems none are exactly what I am experiencing. Here is what I have done:
    +Disconnected all peripheral devices (except for keyboard and mouse).
    +Unplugged power cord and plugged back in.
    +Unplugged ethernet cable.
    +Removed added memory.
    +Reset the SMU button on the logic board.
    +Reset the PRAM by pressing Command-Option-P-R keys. It makes its second start up chime but I still get the grey screen.
    +After opening the disc door with a paper clip, started up while pressing "C" with Hardware Test CD which found no problems.
    +However, also started up with Systemworks disc and ran Disc Doctor, but I get an "unexpected problem, Error found: disk error" while "Checking Directories: Catalog Structure". When trying to run Speed Disc, my hard drive doesn't even show up in the window to select it. Nor does it show up in Disk Viewer.
    I have not tried to start up from the original Mac Startup or installation disc that came with the computer. I am not at my G5 right now (having to use the internet at work). If I start up with that disc, will I loose any work (if I haven't already) that I haven't backed up?
    Also, the G5 manual suggests replacing the lithium battery inside the tower if I am having problems starting up. I have not read to do this anywhere else except in the manual. It mentions having problems with the date and time which I haven't so I doubt it's the battery.
    Any suggestions?
    Thanks,
    Tony
    G5 Power Mac   Mac OS X (10.0.x)  

    First and foremost you should never use Norton Utilities Disk Doctor or Speed Disk. They will corrupt your hard drive. NUM is not compatible with modern Macs and is no longer supported by Symantec. I highly recommend you uninstall it. You will find instructions here.
    You should do the following:
    Boot from your Tiger DVD. After the installer loads select your language and click on the Continue button, then select Disk Utility from the Utilities menu . After DU loads select your OS X volume from the list on the left, click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now shutdown the computer for a couple of minutes and then restart normally.
    If DU reports errors it cannot fix, then you will need Disk Warrior (3.0.3 for Tiger) and/or TechTool Pro (4.1.1 for Tiger) to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    If this does not fix the problem, then it's possible your system files have been damaged in which case you may need to reinstall OS X. You can do this by an Archive and Install which does not require erasing the hard drive. However, the hard drive must be verified as OK per the preceeding intructions.

  • Why is my iPod frozen on the Apple logo screen

    We've tried re-setting it & it's still frozen on the apple logo screen.

    Try:
    - iOS: Not responding or does not turn on
    - Also try DFU mode after try recovery mode
    How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
    - If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
    - Try on another computer
    - If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
    Apple Retail Store - Genius Bar       

  • I just restarted my phone, and now its frozen on the apple logo screen it shows when it restarts! anyone know how to get it to work?

    My phone is frozen on the apple logo screen that shows when restarting. I tried to restart it again, but it still freezes and stays on that screen . I really dont want to reformat! Does anyone have any idea how to fix it?  THANKS!

    You have to put it in dfu mode, when its plugged into itunes reset it by holding the home and the power button, when it starts back up let go of the power button and just hold the home button it should find your phone and say its in restore mode. from there you just have to restore it

  • G5 dual 2.7GHz refuses to get past the grey apple logo screen no matter what I do!

    Hoping that someone might be able to help, as I think I have tried pretty much everything and I’m running out of ideas now!
    It’s a G5 dual 2.7GHz that refuses to get past the grey apple logo screen no matter what I do!
    everything passes the extended apple hardware test (2.5)
    3GB of RAM (2x1GB brand new from crucial)
    won’t start from a original OS 10.58 disk
    passes disk utility when connected to another mac via FW target mode
    nothing other than keyboard/monitor attached
    all of this done; http://support.apple.com/kb/TS2570
    tried alternative HDD’s without any joy
    won’t safe boot
    stays at the grey apple logo screen and the fans then start revving up excessively
    Any other suggestions or advice very gratefully received!

    BDAqua wrote:
    Seems strange that it's trying to invoke "AppleIntelCPUPowerManagement" on a G5, but maybe it's all inclusive???
    Though it exists on my Universal 10.5.8 Install, it does NOT appear to be a loaded extension....
    /System/Library/Extensions/AppleIntelCPUPowerManagement.kext
    BD, is that showing up in your PM's extensions folder?  I wouldn't expect to see it loaded in a PM, but I wonder why the installer loads it unless the 10.5 installer loads a system that could boot an Intel, too, when it installs on a PM.  (I read somewhere this weekend that an Intel will actually boot from an APM formatted disc as well as a GUID formatted disc)  Curious.
    I recall seeing yesterday or Saturday on one of the discussion threads someone having that extension show up in a verbose boot on a PM that was having problems booting into Leo.  I think I advised trashing the kernel caches and touching Extensions in that one, but it is puzzling that it shows up here as well.
    This is the other discussion: https://discussions.apple.com/message/15161427#15161427

  • The Macbook Pro will not start past the grey Apple logo screen? Any help will be most welcome?

    The Macbook Pro 13, late 2009 will not start past the grey Apple Logo screen?  Any help will be most welcome? Thanks

    Have you tried booting with the install disc that came with your computer?
    Find it and then run Disk Utility to verify your hard drive. If errors are found, try to repair the disk.
    It sounds as if the hard drive might be failing.
    Clinton

  • PowerPC Mac Mini gets stuck at grey apple logo screen, wont start

    I have a bit of a problem and would appreciate some help, im not especially good at this stuff.
    My Powerpc Mac Mini froze up recently, having left it on for a few days without shutting down/resetting. I impatiently turned it off with the power button at the back. When I turned it on again, it only got as far as the grey apple logo screen, it now refuses to go past this screen despite numerous power resets, and unplugging at the power.
    I have reset the PMU and the PRAM as suggested by the troubleshooting, to no avail - the PRAM did work as it changed the resolution of the apple logo, but still got stuck at the grey startup screen. Its out of warranty so I have to pay for technical support. Can anyone help?
    Message was edited by: misternuge

    If you have the original install disk that came with your mini, the first thing to do is to insert that, and then boot the system holding the C key down. This should force it to boot from the install disk rather than the internal drive. The reason you want to do this is two-fold: firstly that if it boots OK that way, it shows the basic hardware is OK, and secondly, it's possible that the hard drive has developed errors (likely directory damage) and the tool to check for that and attempt to resolve it is on the install disk.
    Once you've got the system booted to the install disk, exit the installer and run the Disk Utility application. That should display the internal drive (and the install disk) on the left. Select the internal drive and then click 'Repair Disk'. If no errors are found, the drive is fine and the problem lies elsewhere. If errors are reported and the disk is fixed, then you should be able to reboot normally afterwards. If errors are found and Disk Utility reports 'error on exit' not having fixed them, then run it again just to be sure, but otherwise it means the drive is damaged sufficiently that Disk Utility can't fix it. A third-party application such as Alsoft's DiskWarrior will then be needed if you want to try and fix the drive and recover data, or you can simply elect to do an erase and install, meaning the drive will be reformatted and a new copy of MacOS installed. Do not do this if you have data you need to get off the drive!!

  • I replaced my 2010-2011 iMac internal HD i dont have an install disk i created one with my external HD but when i go to install lion onto my imac it stays at the apple logo screen.HELP ME PLEASE!

    I replaced my 2010-2011 iMac internal HD i dont have an install disk i created one with my external HD but when i go to install lion onto my imac it stays at the apple logo screen.HELP ME PLEASE!

    Boot from the original Install disc that came with the computer and then format the drive Mac OS Extended (Journaled) using the GUID partition. Then  you can re-install OS X. If you no longer have the original media call AppleCare with the serial number of the machine (look on the bottom of the stand) and for a nominal fee they will ship you replacement media.
    The chances are very good you will have fan problems if you used an off-the-shelf HD, beginning in 2009 Apple began using HD's from vendors that incorporated heat sensors into the HD. If you did not buy the same type of HD your computer will think the HD is overheating causing the fans to run at full speed.

  • HT201274 My iPod touch got restarted and frozen on the apple logo screen after I erased all content and settings. And it got restarted and frozen again every 5-10 mins until low battery.

    My iPod touch got restarted and frozen on the apple logo screen after I erased all content and settings. And it got restarted and frozen again every 5-10 mins until low battery. It also doesn't recognize by iTunes. Did any one has the same problem? And how did you solve it? Thank you.

    Try here:
    iOS: Not responding or does not turn on

  • My Imac G4 is stuck on apple logo screen with a spinning wheel

    My imac won't boot past the logo screen and the spinning wheel.

    Hello, 
    Notwithstanding Barry's point; try working through this article.
    mrtotes

  • How to fix your iPod when it's frozen on the apple logo screen?

    I tried to charge and restart it, but neither one worked.  It has remained on the apple logo screen for two days. 

    Two days is two days too long. Read this which will eventually lead you to the procedure to restore the iPod:
    iOS: Not responding or does not turn on

  • IMac g5 stalls on grey apple logo spinning gear screen, help please.

    I hope someone can help, please.
    I have an iMac G5 (without isight) and it doesn't want to startup. It stalls on the grey apple/spinning gear screen, with the spinning gear perpetually rotating. I've kept it on for at least twenty minutes and still nothing. Because, I've seen this screen stall when updating OSX before.
    I've flashed the pram and the power management. I've also gone into single-user mode and done everything the apple support page has said: to no avail. I've tried to start in safe mode but I cannot.
    I'm running max os x 10.4.10.
    One other thing worth noting, the light on the bottom right of the iMac case goes on when powering up but fades out and goes dark by the time I reach the grey apple screen?!?!?! I think I remeber this light always staying on when the computer was on.
    If anyone has any ideas on how to fix this, I would greatly appreciate it.
    Thanks!

    It could be that your power supply is failing, see if you qualify for Apple's power supply or video and power issues.
    Please post back.

  • Trying to install the snow leopard update, but get a grey  apple logo screen

    I cleaned my imac out, and now want to install snow leopard (NOT LION), I already installed Leopard, and the machine works, but when I try to install snow leopard, it runs(installs) and after a while it gives a message that it will finish installation after restarting , but then it just gives a grey screen with a apple logo, and nothing happens, cant use the keyboard also, its been standing on this screen overnight(so Im not impatient ) I then switch it off at the power button and restart it keeping eject in, it ejects the disk and then starts with the normal leopard os, I can open/close/use programs/aperture/itunes etc. and the machine seems just fine, its just that it will not work(finish installation of) after I try to install snow leopard.
    I have installed snow leopard on a few occasions before like this on this imac and my MBPro, and had never had this problem.
    I have reinstalled leopard and tried reinstalling snow leopard a couple of times in the last day, and there seems to be no problem with the machine, aka it works fine, it will just not load SLeopard,
    I dont have a time machine backup, as I dont use it, all my data are on a external disk, (which I did a few minutes before erasing my imac   )
    I have erased disks and reinstalled it, installed it over the existing leopard, used disk utility , verified disk, verified permissions , but no luck
    please help !!
    (it seems that my spell checker doesnt work in this box/forum   )

    Do tell us HOW it was fixed.   It helps others.

  • Please help me!! My Power Mac G5 is stuck at the grey apple logo screen and nothing is working!

    My computer froze a few weeks ago and I got a grey screen that told me I needed to restart the computer.  When I restarted, the computer froze on the grey screen with the apple logo. No pin wheel. Nothing. Eventually the fan begins running at warp speed.  I've scoured this discussion board for a solution and I've read every possible thing I can find on the Internet regarding this issue.  Nothing is helping.  I've tried reseating memory, resetting PRAM, I replaced the PRAM battery, all the standard stuff on the message boards. I can't run a disk, i cant boot from a disk holding down c, but I can hold down the option key to open the hardware test, I've done the extended and short test and passed both.
    When I hold the shift+command+v it tells me-
    com.apple.driver.appleintelcpupowermanagement isn't a valid Mach-o (magic is cefaedfe)
    Error mapping module file com.apple.driver.appleintelcpupowermanagement
    Can't map com.apple.driver.appleintelcpupowermanagement in preparation for loading
    Can't determine dependencies " "
    Can't alloc class " " blah blah blah
    I'm pretty sure this is some sort of kernel panic. This computer has been pretty much trouble free in the 8 years I've owned it.  I had recently upgraded iLife to iLife 07 before the trouble happened.
    I've also been able to get it to boot once or twice since then. I get a message that says" the computer was shut down blah blah do you want to send a report to apple?" I'm able to do some basic stuff like back up some pictures onto my external hard drive and then it will freeze again and the fan will come on. While I had access to the desktop I checked the disk repair permissions and they were all messed up.  I tried repairing permissions but I don't think it worked.  Also the time and date was messed up which made me think it was a battery thing.   Lately I haven't been able to boot at all past the apple screen.  I don't have much money but I have to get this fixed!
    Some specs--
    Power mac g5
    CPU @1702037.8 ghz
    Boot rom version 5.2.4f1
    Memory 8 gb, 400mhz
    Pmu/fcu versions:127/6.0.1 f0
    Running OSX 10.5.6
    Just to be clear this is the power pc from around early 2005, not the intel based g5, not the water cooled one, and not a Mac Pro!
    Please help me!!

    HI, have you blown the dust out lately?
    Does it boot better/further if allowed to cool?
    If you're sure the RAM is good, try the Hair Dryer trick...
    http://discussions.apple.com/message.jspa?messageID=13240047#13240047
    https://discussions.apple.com/message/15223603#15223603
    https://discussions.apple.com/message/15499912#15499912
    https://discussions.apple.com/message/15613068#15613068
    https://discussions.apple.com/thread/3270112
    https://discussions.apple.com/message/16053892#16053892
    No power light at all...
    https://discussions.apple.com/thread/3692775?tstart=0
    It can show on any G5, and even many other computers & electronic devices of the period.
    http://www.macintouch.com/reliability/pmg5.html
    http://lowendmac.com/ppc/power-macintosh-g5.html
    And see this last one in particular...
    https://discussions.apple.com/message/16781690#16781690
    Heat gun better...
    https://discussions.apple.com/thread/3916312?tstart=0
    If we don't get more help or answers here, feel free to join my site & ask...
    http://x704.net/bbs

Maybe you are looking for