iMac Intel 27" EMC 2374, AMD Radeon HD 4850 Video Card Removal & Repair - iFixit Repair Guide
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Macbook Pro GPU Repair | Mac Repair Specialists | IT-Tech Online
Apple Initiates Video Repair Program for 2011-2013 MacBook Pros
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Need to repair this iMac 27" 2011, Please any suggestions? GPU Temperature is not even 50 C : r/mac
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How to Upgrade/Replace GPU Graphics Card on Mid-2011 21.5" iMac - YouTube