Helping a friend fix up his mid 2011 iMac 27 inch, it seems to have a few problems : r/mac
Repair of an iMac not loading caused by graphic failure | Laptop and Macbook Repairs Adelaide
Imac 27 Inch 2009-2011 Graphics card replacement - YouTube
Apple Initiates Video Card Replacement Program for Radeon HD 6970M Equipped Mid-2011 27” iMacs
How to Bake a Failing Graphics Processor to Possibly Live Another Day - DreamLight.com
Apple Initiates Video Repair Program for 2011-2013 MacBook Pros
Original Graphics Video Card GPU Replacement for Apple iMac A1311 Mid-2011 Core i5 2.7 MC812LL/A MC812 21.5 Inch Desktop Computer, AMD Radeon HD 6770M GDDR5 512MB Repair Parts : Amazon.co.uk: Computers &