Imac 27 screen problem?

Discussion in 'iMac' started by Wek, Aug 6, 2019.

  1. Wek macrumors member

    Wek

    Joined:
    Dec 5, 2014
    Location:
    Denmark
    #1
    Hi

    We have an old Imac 27 inch. Yesterday the screen made these (picture) lines and no matter what I do, I cant make them disappear? any advice?

    upload_2019-8-6_16-24-58.jpeg
     
  2. Cruz3LT macrumors member

    Cruz3LT

    Joined:
    Jun 24, 2019
    Location:
    Seattle, Washington
  3. Wek thread starter macrumors member

    Wek

    Joined:
    Dec 5, 2014
    Location:
    Denmark
    #3
    Well - the Mac is running, but its hard to use, because of phones coloured lines. I have starte in safe mode, and ordinary mode, but it's the same result.
     
  4. Cruz3LT macrumors member

    Cruz3LT

    Joined:
    Jun 24, 2019
    Location:
    Seattle, Washington
  5. TwoH macrumors newbie

    Joined:
    May 19, 2019
    #5
    Very high chance of GPU failure - going by the picture.
     
  6. Allyance macrumors 6502

    Allyance

    Joined:
    Sep 29, 2017
    Location:
    East Bay, CA
    #6
    Strange lines are not parallel, if there was a problem with GPU or display, would lines be parallel? Reflection?
     
  7. TwoH macrumors newbie

    Joined:
    May 19, 2019
    #7
    They are parallel?? But on second look - he's able to boot into his iMac. Do you have an external display to test if it's display or GPU?
    Same issue on an external: GPU
    No lines on an external: LCD
     
  8. Cruz3LT macrumors member

    Cruz3LT

    Joined:
    Jun 24, 2019
    Location:
    Seattle, Washington
    #8
    These are signs of a GPU on its way out, not fully failed. I asked the op which model to see if it is one of the ones with known GPU issues.
     
  9. TwoH macrumors newbie

    Joined:
    May 19, 2019
    #9
    It literally is a sign of GPU... But yeah, wait for OP to respond, I guess

    Edit: whoops didnt see you said it IS -- so yes, either way, GPU needs replacing
     
  10. mikehalloran macrumors 68000

    Joined:
    Oct 14, 2018
    Location:
    The Sillie Con Valley
    #10
    Replace the NV RAM battery. I’d say how but the above was never answered.

    If the problem persists, then look at the GPU.
     

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9 August 6, 2019