I have a problem. I bought an acer aspire desktop on ebay with the intention of fixing it the description said that the computer was over heating and shutting off. well after further testing the computer does not overheat or shut off but the computer locks up intermittently and I have to do a hard power off and turn it back on with or without a harddrive it will do it if the computer over heats i have not been able to find what is overheating. Both fans in the system are working i took the fan and heatsink off of the cpu and the thermal paste seemed to not be applied very well so i cleaned what was on there off with alchohol and applied new thermal paste. that did not fix the problem. I am going to run memtest on it when i get home from work tonight to see if the ram is the culprit but any help would be greatly appreciated.