HT204156: About the screens you see when your Mac starts up

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Ladywriterjan
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Q: My IMac is starting up and coming to a black screen with thin vertical white lines.

My IMac is starting up with login, then going to gray screen, lighter screen and finally to a black screen with thin white vertical lines.

Thanks for the help

iMac (27-inch Mid 2011), OS X Mountain Lion (10.8.5)

Posted on Sep 27, 2015 4:41 PM

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Ladywriterjan

Q: My IMac is starting up and coming to a black screen with thin vertical white lines.

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  • by bruxxx,

    bruxxx bruxxx Jan 24, 2016 11:18 PM in response to Ladywriterjan
    Level 1 (39 points)
    Mac OS X
    Jan 24, 2016 11:18 PM in response to Ladywriterjan

    Did you ever get an answer or resolve this?

     

    I just experienced the same thing.  My screen started to flicker and then

    just went to this black with thin white lines pattern on it.

     

    When I rebooted it came back up normally for a short while and then did

    the same thing.  Over the next 20 minutes or it it would go to that screen

    as soon as the boot progress line would quit.

     

    I tried booting from another boot partition, same thing.

     

    I tried to boot with the shift key held down ... thought I am not sure what that

    is supposed to do, but it just hung at an all white screen.

     

    I'm assuming this is probably a hardware problem?