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Feb 16, 2016 10:17 PM in response to kristiangby rkaufmann87,★HelpfulThis gives every indication of a GPU failure. See if he qualifies for iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program - Apple Support, chances are not however it's worth a try.
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Feb 16, 2016 10:17 PM in response to rkaufmann87by kristiang,Good thinking! I forgot about that one, despite getting my own replaced a few years ago. I'll see if he's got an affected GPU. Thanks for that!
