iMac shuts off then won’t bootHi all, I could use some help repairing my 2011 21-inch iMac. It’s the first time I’m trying my hand at this sort of thing...
Réponse à : « iMac shuts off then won’t boot »I finally bit the bullet and bought a replacement graphics card. (It’s a downgrade to the type of card in the base model but whatever, it was expensive enough as it is.) Installing it fixed the problem. After detaching the previous card from the heatsink I saw that the VRAM chips had barely any of the gummy thermal pads left. They clearly weren’t replaced when the Apple-authorized service center replaced the card. So the most likely explanation is that those chips overheated, causing damage. Very amateurish of them. I won’t go there ever again.