netfreak
Well-known member
I had looked under the heatsink before and the CPU did not look like it was cracked, and after my recap I also cleaned the CPU to add more heatsink compound. I've been super careful with the heatsink but I suppose something may still have broken at some point. I have a spare board with the exact same symptoms and the CPU looked OK on that one too. Now I'm not sure if I have two faulty boards or two faulty power supplies or who knows.Have you looked under the heat sink? Every 7100 I've had my hands on needed its heat sink paste cleaned off and replaced. I don't know why the 8100s and 6100s didn't but that was 15 years ago. I imagine all the NuBus PowerMacs need their heat sink paste replaced by now. Still, you would get a good start up bong if the problem was just bad paste. Bong and then immediately overheat...
So, look under the heat sink and check whether the CPU is cracked. It's usually possible to tell by eyeball.