I wrote quite a bit more about my problem before I got to the page asking for a "brief description of the problem" , but it seems only the "brief description" has showed up... In the lengthy description I originally wrote, I stated that I suspected the CPU is faulty since I bought it used. I also stated that I have since replaced th old P4 and everything seems to be working fine. Sorry guys, I'm new to this... Anyway, I'll try updating the BIOS on the mobo. Will post my progress as go along. Thanks for the help, everyone.