**UPDATE** After trying for months to figure this problem out and nearly throwing the machine out the window I've found the issue for certain. It was the processor. I received the replacement a week ago and haven't had a problem since. Everything runs fast, cool, and without error. Thanks to all who helped out. **UPDATE** I’ve been having a problem where my computer will “freeze” and just sit there. No errors, no BSOD, just frozen until I do a hard reset. Upon reboot there are no indications of any errors, there aren’t any errors in any of the system logs, and there aren’t any logs in the minidump folder for windows. I’ve left the machine on for more than an hour and it just sits there frozen. System specs: Windows XP SP2 Asus P5N-D Nvidia 9800GT 2x 2gb Corsair XMS DDR2 Memory Corsair HX620 Power Supply I believe it to be one of the components causing the issue and would love some help on how to isolate the troublesome component. Here’s where I’m at. I thought it was the video card so I swapped it out with an ATI 1950X. I got another lockup. I removed one of the sticks of RAM and placed it into another machine and that machine runs great. No errors or lock ups. Just to verify that the 9800gt was good I placed it in the same machine as the RAM and it also runs like a champ. So now I’m stuck. I’ve been getting lockups in the machine for several months and they were getting progressively worse. Something isn't working right. Any suggestions?