iMac keeps freezing needing hard reboot

Discussion in 'iMac' started by yoricardo, Nov 26, 2015.

  1. yoricardo macrumors member

    Joined:
    Jun 24, 2010
    #1
    I have a 21.5 inch, mid 2011 iMac and recently it keeps freezing. The mouse will move around the screen but I cannot click on anything. The only way to clear it is to do a hard reboot by pressing the on/off button at the rear of the computer. It is particularly bad just after waking from sleep.

    I had a similar problem a year or two ago and the only thing that cleared it was a complete wipe of my Mac and then reinstalled everything, but I shouldn't need to do this every year or so?

    Weirdly, I have also had these random pink squares coming up on the screen (images attached) which would seem to suggest that it is a graphics issue.

    Any ideas, anyone?
     

    Attached Files:

  2. yoricardo thread starter macrumors member

    Joined:
    Jun 24, 2010
    #2
    Bump - anyone able to offer any suggestions please?
     
  3. Samuelsan2001 macrumors 603

    Joined:
    Oct 24, 2013
    #3
    It's almost certainly a graphics card failure back it up now while you still can. If it is a model with the AMD Radeon HD 6970M there was a repair program from apple running but that may have finished now.
     

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