Crashing/coloured spots flashing

Discussion in 'iMac' started by PokerGuy, Dec 17, 2013.

  1. PokerGuy macrumors member

    Joined:
    Sep 14, 2010
    Location:
    London
    #1
    Having major issues with my iMac (i7) which is about 4-5 years old.

    It keeps randomly crashing/freezing and also I am getting large groups of flashing and static blocks of coloured spots - I have uploaded a short video of an example here:

    http://www.youtube.com/watch?v=qaXyqCtC4Dw&feature=youtu.be

    Anyone have any ideas what I should do? Is it likely to be hardware or software problem? Would a factory reset stand some chance of resolving it?

    Any help much appreciated, as always :)
     
  2. Diversion macrumors 6502a

    Diversion

    Joined:
    Oct 5, 2007
    Location:
    Jacksonville, Florida
    #2
    Looks like the GPU (graphics) are going out.. What GPU does it have? First thing i'd try is a full wipe and reinstall of OSX. If that doesn't work, i'd take it into Apple to get a quote to have it fixed. I would hope they wouldn't charge you for a full logic board.. not sure if the GPU by itself is replaceable.
     
  3. PokerGuy thread starter macrumors member

    Joined:
    Sep 14, 2010
    Location:
    London
    #3
    Thanks for your reply - it has ATI Radeon HD 5750 1024 MB

    I am going to try the complete reinstall - I haven't ever done one on a mac (which I guess shows how great they are overall - I remember doing them every few months back on my PCs) - is it pretty straightforward? Is there a simple tutorial that would show me how to do it?
     

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