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  1. #1


    Member Since
    Feb 17, 2017
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    4
    iMAC WHITE SCREEN NO BOOT ETC
    I have white screen no boot stuck on apple logo time bar then goes to white screen. Have no discs and no hardware test - command D does nothing. Its a early 2008 Imac running Yosemite. Ran all recovery disc repair etc two or three times, When I tried to recover the disc it was grayed out and inaccessible for a further repair. Tried reinstalling OS made no difference. Tried booting form external drive - goes past apple logo to a plain blue screen that then changes to an odd broken pixel image across the screen.
    At a loss without the hardware diagnostics option I have no idea how to get access to a disc for diagnostics any ideas?

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    23,387
    Specs:
    Imac 27", i7 4GHz, 1TB Flash Storage, 32GB memory, OS X.12.3
    You have maybe a dead hard drive or even a dead logic board.

    If you have the original DVD that came with the machine use that. Command D does nothinbg as your computer is too old for that. Hard Test is on the original DVD. You are between a rock and a hard palce. The best option may be to purchase OS X.6 Snow Leopard on a DVD from Apple Online for $20.00 and start with that.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3


    Member Since
    Feb 17, 2017
    Posts
    4
    Thanks for the reply harryb .
    Unfortunately no discs came with the machine as it was bought as a used machine for my son who has limited funds for an expensive repair. It had a failing hard disc flagged two years ago and I managed to replace this myself cloning the original Hitachi drive which was quite straightforward. The drive I used was a brand new 1tb Western Digital blue that I had over from a PC build. The old drive, although signaled as failing, was working fine and I placed in a caddie for emergencies such as what has happened. I thought I may have been able to boot from this drive and it does in fact go further but to a blue screen and then a white one with confused graphics across the screen. Would snow leopard have the correct diagnostic files? Are there any third party diagnostic discs available?
    I suspect it may be a logic board problem personally my son always had the machine on for days on end and it always seemed to produce a lot of heat which may have finally taken its toll.
    What I cannot understand though is why I could run disc repair successfully a couple of times, once using control "v" command and then when I tried to get some files off of the drive it was suddenly grayed out.
    Thanks again.

  4. #4

    ferrarr's Avatar
    Member Since
    May 21, 2012
    Location
    Pawtucket, RI, USA
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    2,449
    Specs:
    L2014 Mac mini macOS 10.12, iPhone 6 iOS 10, iPad Pro 1 12.9" iOS 10,  Pencil 1
    This has been posted here before, it is for Apple Hardware Tests, but I haven't neede to use any yet. I hope you can find the test you need.

    https://github.com/upekkha/AppleHardwareTest
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  5. #5


    Member Since
    Feb 17, 2017
    Posts
    4
    Quote Originally Posted by ferrarr View Post
    This has been posted here before, it is for Apple Hardware Tests, but I haven't neede to use any yet. I hope you can find the test you need.

    https://github.com/upekkha/AppleHardwareTest
    Much appreciated ferrarr.

  6. #6

    Slydude's Avatar
    Member Since
    Nov 16, 2009
    Location
    North Louisiana, USA
    Posts
    11,162
    Specs:
    2.8 GHz MacBook Pro 10.11, 8 GB mem, iPhone 6+
    Nice find there Bob. Thanks for posting.
    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  7. #7

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    23,387
    Specs:
    Imac 27", i7 4GHz, 1TB Flash Storage, 32GB memory, OS X.12.3
    Well Pete I never turn my Macs off, unless a thunderstorm is predicted. That running repair is a sign things were beginning to go haywire with the hard drive. Going on for ten years is a pretty good run so I guess you have to decide if it is worth spending money on.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  8. #8


    Member Since
    Feb 17, 2017
    Posts
    4
    Thanks for the input guys.
    I have now had the imac diagnosed and the conclusion is a faulty graphics card and have been quoted 280 (I'm in the UK) to fix.
    Hard drive is good which is the main thing.
    I had no idea it would fail to boot with this problem but managed to get further with the external drive with the strange screen graphics.
    This is a common problem I gather and usually an issue with the solder joints on the GPU.
    Could be a scrapper unfortunately as the cost of repair outweighs its value unless I try the You tube "oven bake trick" Anyone heard of this or done actually had success with this?

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