OK, so, I've been having trouble with my CPU overheating for a while and not actually bothered to do much about it, I've cleaned out the fan and that helped temporarily (around an hour) and then I had problems again. I'm using a Pentium 4 560 3.6ghz (It's a prescott), and I know that they do have heat problems, but it's idling at 75-80c. The ambient temperature of the room is 30c. I'm not as concerned about the GPU temperature, as I know my airflow is rather crap in the case, and the only fan I have in there is for my CPU. From what I can see the heatsink is on fine, I was thinking about removing it and checking if the thermal paste had been applied properly (I didn't actually install the heatsink), but I'm a little bit apprehensive about checking it out as I know you can damage the CPU fans. So, any ideas what the problem can be?