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late 2012 iMac graphic issue

BJB Productions

BJB Productions

macrumors 65816
Original poster
Nov 10, 2008
1,314
136
Hi all,
We have a 27" iMac that is having some severe graphic issues. I've attached some photos to explain the problem.

We mainly use this machine to edit in Adobe Premiere CC and for use with other Adobe products. Our issue is that periodically (maybe ~8 times a day) the machine will either:
a) start showing distorted graphics
b) freeze completely and require a hard boot.

I brought it to the Apple store and they ran hardware tests and no problems were found. I also have reinstalled the OS. Even right now as I'm typing this there's some blocks of white that are stuck on the screen. (Image attached)

Any thoughts on this? Specs shown below as well.
 

Attachments

  • Screen Shot 2013-09-30 at 11.13.51 AM.png
    Screen Shot 2013-09-30 at 11.13.51 AM.png
    1.2 MB · Views: 106
  • Screen Shot 2013-10-09 at 9.52.31 AM.png
    Screen Shot 2013-10-09 at 9.52.31 AM.png
    1.9 MB · Views: 89
  • Screen Shot 2013-10-09 at 11.52.07 AM.png
    Screen Shot 2013-10-09 at 11.52.07 AM.png
    25.1 KB · Views: 84
  • Screen Shot 2013-10-09 at 11.56.22 AM.png
    Screen Shot 2013-10-09 at 11.56.22 AM.png
    89.6 KB · Views: 81
Looks GPU-related. The only thing you can try is put back in just the original RAM (assuming you added your own later). See if it makes any difference. Probably not, but worth a try since it only takes 60 seconds.
 
Sure looks GPU related. Did you show them your screen shots at the store? Do you have a reseller with a service department? My experience with Apple store service has not been great in the past. My local dealer has been waaay more helpful with trouble shooting.
 
Confirmed that it was indeed the GPU. Did a test opening my Premiere file using Mercury Playback Engine Software only vs GPU Accelerated and have had zero issues (besides editing being slower)

So swapping it out later today.
 
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