Something strange is happening to my desktop PC (Pentium 3 850 running Windows 2000 Pro). I don't use the computer very much as I do most of my work on my laptop. I just use the desktop for FTP and other things and I have had it running at another house. Lately I went to pick up the machine to move it to my new place. For some reason now it will hang after about 10 minutes. Once it hangs the screen goes dead and I will have to shut down the power to get it to reboot. A few times it would not reboot at all and so I took the cover off and then it would. I have had the machine for a few years and it has always worked fine. I have two case fans in addition to the CPU fan. The fan on the CPU is working and the heatsink is secure. Does anyone know what the problem could be? Overheating was my first guess but as I said, all the fans are working and it is not noticably warm inside the case. One clue may be that the screen goes dead when it hangs. Any help greatly appreciated.