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  1. #1
    iMac Video? problem, won't boot

    Member Since
    Jul 12, 2012
    Posts
    3
    iMac Video? problem, won't boot
    I have an iMac 24" 2.8ghz that won't boot up. The DVD drive and hard drive are tested to work, and I can get to the boot menu and select either to boot from. However after choosing either option the computer hangs and often displays a blank screen with only the mouse moving or a white screen with grey dots (like the apple logo exploded horizontally across the screen). I took a pic for reference DSCF6319.JPG.
    Has anyone seen this before? Could this be a video card failure, or something else?

  2. #2
    iMac Video? problem, won't boot
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    45,216
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    What happens when you attach an external monitor or TV to the iMac? Normal, or the same?

  3. #3
    iMac Video? problem, won't boot

    Member Since
    Jul 12, 2012
    Posts
    3
    RE: external video
    I have to go out and get a mini dvi adapter. Will let you know if that works.
    If an external works but not the main display is that the video card failing?
    BTW, I tried booting a Linux disc and I heard sound with black screen.

  4. #4
    iMac Video? problem, won't boot
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    45,216
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    If an external works but not the main display is that the video card failing?
    No. It means the main display has a problem. If both the iMac and external monitor show the same symptom, then it's likely a bad graphics chipset.

  5. #5
    iMac Video? problem, won't boot

    Member Since
    Jul 12, 2012
    Posts
    3
    When I hold the option key when I boot up it will show the hard drive and dvd drive just fine.
    Just anything past that gets funky.
    Thanks for your help!

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