Recently removed and reinstalled mb - ECS PT800CE-A1.1 with 478 Prescott CPU, attempted to add a new heatsink and fan, temps went to 90C before shutdown. Decided to go back to original heatsink and fan using new brackets (old ones broke) and I am still having an overheating problem, going to 76C+ idling before shutdown. Normally this system would operate between 45C-55C or 60C+ at loads. Nothing is different at this point except the thermal compound, I had silver originally, this one is white.