Hi, I just wondered if the problem doesn’t lay in the thermal paste that’s too old and dried, because of the over heating ?
My son got a old PC from his cousin and we cleaned it from the inside dust, and therefore, I removed the heatsink of the CPU, but when putting it back, I didn’t bother of putting some new thermal paste. So the computer would just work for a few seconds and stop.
Same thing is happening with my iMac, it works, but the screen goes black in just a few minutes, often before the startup has ended.
So there could be a overheating problem in the GPU simply because the thermal paste is out of use ?
It seems too simple ;-)