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What are the symptoms of a potential graphics card failure?

I am having issues where the mid-2011 iMac will crash when switching desktops, flash pixellated images at random locations on the screen, etc. I cannot do a screen capture on this since it will only capture what the screen should look like, and will not show the issue. I have uploaded two pictures of the display.


User uploaded fileUser uploaded file


Any help appreciated.

iMac, macOS High Sierra (10.13.2), null

Posted on Feb 20, 2018 8:20 AM

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5 replies

Feb 20, 2018 11:30 AM in response to stmccann

Is your graphic card a AMD Radeon HD 6970M? That year iMac had bad cards in some of them and had a recall on them instigated. The recall time frame has long lapsed but I'm guessing you have a bad card. You can verify that by taking your iMac to the nearest Genius bar and getting a free diagnostic.


My card went out a few years ago just within the time frame and I got it replaced free.


User uploaded file

What are the symptoms of a potential graphics card failure?

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