iMac 27" suffers graphics issues when waking from sleep

Discussion in 'iMac' started by stuiesav, Jan 6, 2014.

  1. stuiesav macrumors newbie


    Jan 6, 2014
    London and the Interweb

    I wonder if anyone can help. I have a late 2013 iMac 27 that when awaking from sleep the screen goes from black to pixalated mess (you can just about make out the login box)..

    It also has a secondary screen connected via a thunderbolt cable to a Dell (VGA connector) screen. The secondary screen DOES NOT get corrupted

    Recent s/w changes i have made are: Update to VMWare Fusion & install of Universal Media Server. Vmware is running a single instance of Windows 7. Updates have both been backed out with no recovery of the situation

    Tried claring PRAM etc - no change

    The problem does not go away - every time the machine enters sleep mode and i awaken it (via mouse or keyboard) the problem persists

    A hard reboot (power off and on) clears the problem until the machine next goes to sleep

    specific part number / spec is as follows:

    IMAC 27/3.2QC/2X4GB/1TB/GTX675MX
    Part Number: MD096B/A

    If anyone has any ideas - would be much appreciated.

    Thanks and regards,

  2. Twimfy macrumors 6502a


    Sep 11, 2011
    Late 2013 = Still in warranty. Take it to Apple just incase something is really wrong with the GPU or worse.

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