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All replies
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Helpful answers
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Mar 7, 2015 2:03 PM in response to loriffby Old Toad,★HelpfulIt could be a stuck pixel (but looks too big) or a problem with the graphics card. See if your iMac is included in this recall: iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program - Apple Support
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Mar 7, 2015 3:06 PM in response to Old Toadby loriff,Thanks for the response. My graphics card is not the same, it is a 6770M.
