iMac screen problems

Discussion in 'iMac' started by Craig Attacks, Oct 10, 2018.

  1. Craig Attacks macrumors newbie

    Craig Attacks

    Oct 10, 2018
    E54A0FA9-D634-412F-ABA2-0564C6221F84.png C24B2108-8E9A-4546-9349-4C45805D445A.png

    Hi all,

    I have a late 2015 27” iMac that has been a workhorse for the last couple of years. I was working on it this morning, then rebooted and it took about three minutes (very unusual). When it finally loaded the login screen, the display loaded in sections, like horizontal lines (almost like Venetian blinds opening). It does this a few times, then flickers whenever I try to do anything on it. Documents open but load in horizontal lines. Videos don’t play, and when I press the volume key, there is a symbol indicating that there is no audio. The screen often flickers too, depending on what I’m doing, and the fans have fired up on and off even when on the desktop. Hard drives have plenty of space and this is a very well looked after machine. Could it be GPU related?

    Any help greatly appreciated, before I box it up and drag it to the Apple Store.

    Pics attached.

    Many thanks in advance,

    / Craig
  2. cwanja macrumors 6502a

    Jun 23, 2010
    If I remember correctly, vertical lines point to a bad graphics card and horizon lines mean a bad display. Based upon what you are reporting, it it is likely the screen.
  3. signuphere macrumors newbie

    Aug 12, 2017
    Get an HDMI cable and plug it into a display (TV) to confirm it's got a bad screen.
  4. tromboneaholic Suspended


    Jun 9, 2004
    Clearwater, FL
    That's how it looks when it's started in "Safe Mode" by holding down the shift key to prevent certain drivers from loading. It could be software related.

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