I've heard a few things this could be, graphics card, gpu, sound card, trying to figure out the right one… : r/mac
09 27" iMac GPU failure... again? | MacRumors Forums
2019 iMac - Graphics card issues? : r/mac
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09 27" iMac GPU failure... again? | MacRumors Forums
09 27" iMac GPU failure... again? | MacRumors Forums
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SOLVED: Does the 2012 model have the same GPU issues as the 2011? - MacBook Pro 15" Unibody Mid 2012 - iFixit
