Solved 2011 Imac Shuts Down Few Seconds After Power On Imac Intel 27
Chosen Solution My 2011 27’’ iMac had a graphic card problem (vertical lines on the screen) I took the opportunity and upgraded the card from 1gb to 2gb. When I turn on the mac it start to boot and suddenly shuts off I can turn it back on again and it happens again and again. I tried to make NVRAM Reset and it didn’t help. I took out the power cord from the mac, waited few seconds, pressed the power button for 10 seconds, then, I pressed the power button and hold while putting back in the power cord and powered on the iMac....