Recently my wife's computer became very sluggish and finally just quit. So I checked it out and found out the plastic CPU retainer bracket that keeps the heat sink pressed firmly against the CPU had a broken leg. I removed the Heat sink to replace it and the retainer bracket, but while I was in the shop my wife turned the computer on. When I returned, the power supply had quit working. I'm assuming that the extreme heat killed the power supply. I replaced the power supply, installed a new heat sink using a good grade cooling paste and it went back to work, but for some reason it's running very slow. I did all the usual checking for viruses, running disc cleaner and defragger, but it continues to be slow, but doesn't freeze up anymore. Now, I'm wondering if turning the computer on without the heat sink damaged the CPU or could it be the hard drive. Anyone have any ideas?