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Upgrading the graphics in our 2011 iMac (first attempt) - YouTube
Apple opens graphics card replacement program for some mid-2011 iMacs - 9to5Mac
Burn the VGA and Fix your iMac - Don't Pay Shitty Problems!!! - YouTube
iMac Graphics Card GPU Overheating and Failure
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Genuine Graphics Video Card GPU Replacement for Apple iMac Early 2009 24 Inch Core 2 Duo
Late 2009 iMac 27" Video Card Repair — 4850 — 2nd Bake - YouTube