iMac in Continuous Shutdown/Restart Loop

Discussion in 'iMac' started by robastewart, May 30, 2015.

  1. robastewart macrumors newbie

    Jun 19, 2011
    2011 iMac 27". While Mail and Safari open, reading a webpage, the screen suddenly went to a black and white vertically striped display. I waited a few moments to see if anything would happen, then the machine seemed to shutdown. But then it appeared to go into restart on its own. It doesn't fully restart though -- a screen appears with the dark gray apple and progress bar. It runs on this screen for a minute or two, then goes into shutdown and restart modes again.

    Nothing new or different has been done to this computer in recent weeks.

    Any ideas much appreciated.
  2. Pieterr macrumors regular

    Mar 22, 2015
    The Netherlands
  3. redheeler macrumors 603


    Oct 17, 2014
    As the poster above mentioned, a failing GPU is very much a possibility based on the symptom of vertical stripes.

    For now, I recommend trying to boot into Safe Mode.

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