mountain lion graphic issues/artifacts after waking from sleep

Discussion in 'iMac' started by seniorchang, Mar 11, 2013.

  1. seniorchang macrumors member

    Joined:
    Jun 14, 2012
    #1
    I just updated my late 2007 iMac from Lion to Mountain Lion and whenever I wake it from sleep mode the screen is distorted and full of artifacts, like it crashed or something. I can still see the mouse moving but I can't really read anything since everything is distorted and full of little squares.
    I have to restart the imac using a shortcut then everything is back to normal.


    Any ideas what is causing this?
     
  2. seniorchang thread starter macrumors member

    Joined:
    Jun 14, 2012
    #2
    If anyone is interested here is the solution:

    I installed the ATI drivers from Snow Leopard and everything went back to normal.
     

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