Hi, I just spent ALOT of time resolving this very issue with an HP Pavilion A1010Y. It turned out to be the following: The Heatsink frame had cracked and 2 of the 4 screws that hold the Heatsink to the CPU for cooling, weren't doing their job. Also, NO Thermal Paste remained. I replaced the Heatsink, Fan and Thermal Paste and Now it works fine. Sounds like yours is overheating, just like the one I just fixed. Good Luck Phil