Win XP 450W PS AMD 2.6 ghz 512mb ram Problem: My desktop freezes after the computer is on for about 5 minutes. Sometimes it just freezes, and other times after a min after freezing, the blue error screen pops up with the kernal error message. If I restart, my computer will either freeze, or get to a certain point and reboot over and over. Usually it is slower than normal (as when trying to load the sys files when booting in safe mode). Before this, there were no signs of an issue. If I let it sit overnight and turn it on in the morning, it's as though the 5 minutes of working time I get is reset, and after that I have to let it wait again. Possible Cause: My guess is possibly excessive heat caused by a fan not working as good as it could, or something other heat-related issue. I had a problem with my power supply making a clicking noise when I would unplug and replug it back into the wall, but it would go away after I restarted a few times. that didn't happen for the last 6 months, but I'm thinking the 5minutes of time I get before it locks makes me think overheating, and the less and less directly after I restart makes me think heat even more. Only thing is, I figured it would shutdown the computer instead of restarting. I installed my CPU fan wrong once so it would startup for a few seconds before shutting down. Any thoughts or suggestions or things I can try to do before it locks to check out what might be the problem? Thanks a ton!!