Okay I'll try my best to follow the rules here and post some specs. MOBO: Gigabyte 8I865GME-775 RAM: 1g kingston dual channel PSU: tHERMALTAKE 500W W0120 full psu specs at this link: http://www.thermaltakeusa.com/product/power/purepower/w0120/w0120.asp HD: WD 120 GB / WD1200JB-00GVA0 OS: XP SP2 Display card: NVIDIA GeForce 7600 GS AGP Okay here's my issue I built this PC about 9 months ago. My original cpu was a Celeron D 351 3.20Ghz, it was slow This pc was stable, never had a single crash or reboot, during the many hours of use. Yesterday I installed a Pentium D 935 dual core Presler 3.2GHz. Wanted to speed things up a bit, found a good price at newegg. My pc booted up fine, recognized the new cpu and loaded xp (sp2) but.... I started getting random reboots. After the first reboot I started using a program to watch the cpu temps, I never saw it above 30c, starts at 20c and climbs to around 28c with a 60% load. I figured it had to be the intel stock fan so I installed my old trusty Kingwin. Temps did drop on average , the reboots have almost stopped. And did use Artic Silver 5 I've had one since I installed the new fan 3hrs ago. Before it was rebooting every 2-10mins But honestly all the temp I'm seeing seem much much lower than most users.. right? So what could the reboots be from? Would the CPU upgrade draw more power and make the psu fail? Should I hope that the rebooting stops? Or get an RMA from newegg before my 7 days is up??