Marks on screen

Discussion in 'iMac' started by Handle, Aug 13, 2014.

  1. Handle macrumors regular

    Joined:
    Apr 16, 2013
    #1
    I have a 2009 24" iMac. Recently I noticed that when there is gray or light colors being displayed there are marks going across the screen. It looks like watermarks. There is no pattern, at first I thought the screen was just dirty but after looking closer I can see its definitely behind the glass.

    Any idea what it is? I would assume burn-in but the pattern doesn't match anything I display.
     
  2. Apple fanboy macrumors Core

    Apple fanboy

    Joined:
    Feb 21, 2012
    Location:
    Behind the Lens, UK
    #2
    Dirt trapped beneath the glass was a common complaint on the older style iMacs. Could it be that? Usually described as a dark smudge.
     
  3. Handle thread starter macrumors regular

    Joined:
    Apr 16, 2013
    #3
    It could be that, but it seemed to appear at once recently. You'd think dirt would build up slowly over time.
     
  4. Handle thread starter macrumors regular

    Joined:
    Apr 16, 2013
  5. Dreadnought macrumors 68020

    Dreadnought

    Joined:
    Jul 22, 2002
    Location:
    Almere, The Netherlands
    #5
    Could it be the GPU is acting up? Please monitor the temps of especially your GPU. It could be it can't dissipate it's heat due to dust or it's dying. Try running your fans on maximum speed to blow out dust or open your iMac up and use compressed air to clean it.
     
  6. Handle thread starter macrumors regular

    Joined:
    Apr 16, 2013
  7. h9826790 macrumors G3

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #7
    Is that only happen when the monitor just switch on? It may take some time for monitor to warm up.
     

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