iMac graphics screwing up

Discussion in 'iMac' started by A Macbook Pro, Aug 6, 2011.

  1. A Macbook Pro macrumors 6502

    Joined:
    Aug 22, 2009
    #1
    This seems to happen when I watch a HD YouTube video on my 27'' 2011 iMac. What happens is the bottom half of the video gets yellow lines and flickers a bit. A refresh fixes it but once it happens my whole OS X graphics get screwed up. Here is a picture to show what I mean.

    [​IMG]

    As far as I know only a restart fixes it. Doesn't seem to be occurring in Windows, only OS X Lion.

    Any tips?
     
  2. s.horsfield macrumors regular

    Joined:
    Apr 3, 2011
    Location:
    New Zealand
    #2
    Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_3_5 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8L1 Safari/6533.18.5)

    It's a Lion issue. No fixes as far as I know. Wait for apple to release a update (should be a few weeks time).

    Sorry I couldn't be of more help
     
  3. A Macbook Pro thread starter macrumors 6502

    Joined:
    Aug 22, 2009
    #3
    It's okay, I went on the Apple discussion forums and found another member with exactly the same issue. It's been pinpointed down to the 6970M with 2GB VRAM.
     
  4. AbeFroman77 macrumors 6502

    Joined:
    May 29, 2010
    #4
    No, it's Lion. There's a 40+ page thread so far here:
    https://discussions.apple.com/thread/3194165?start=0&tstart=0

    There's freezing issues after resuming from sleep and artifacting.
     
  5. chrono1081 macrumors 604

    chrono1081

    Joined:
    Jan 26, 2008
    Location:
    Isla Nublar
    #5
    +1 for Lion issue. My MBA did it last night and a restart fixed it. It never did it in Snow Leopard (well at first until the patch came out).
     
  6. leeds utd fc macrumors member

    Joined:
    Mar 7, 2009
    Location:
    Leeds UK
    #6
    I'm also having similar problems with my 21.5 entry-level iMac. Stopping it from sleeping seems to have solved the problem - so far.
     

Share This Page