So I now have the black screen of death on my mid 2010 iMac running OS 10.11.6. Multiple restart try’s the computer turns on but can’t see anything. Call to local reseller/ repair shop suggests the graphic card issue. I have had issues this year with it just randomly turning off. They are looking for stock but I can muddle along with my iPad 9th generation for email, fb, and bill paying for now, Operating system all caught up on the iPad and phone, always happens when you finally get the CC’s all paid off Dave