This computer is no more than two days old since i built it, the following parts were re-used which i purchased brand new (about 5-6months old): ATI X800 300GB (2 Maxtor non-RAID) 37GB Western Digital Raptor Drive Sound Audidy 2 ZS Asus QuestTrack CD-RW 52x32x52x NEC 3540A AMD Athlon 64 3000+ Newcastle 800MHz FSB Socket 754 Processor Model ADA3000AXBOX Patriot 1GB (2 x 512MB) 184-Pin DDR SDRAM DDR 400 (PC 3200) These parts I purchased anew: ASUS K8N-E DELUXE Socket 754 NVIDIA nForce3 250Gb ATX Thermaltake Pure Power W0073RU ATX 520W And my case is a ThermalTake Kandalf. Now, the problem is the computer turns itself off every 3-4hours within use, It does not overheat, Mobo+CPU stay in low 30C's and HDDs stay in high 20C's. It doesn't turn off at any certain cpu level usuage. I took off hibernation, and this mobo (i think, i replaced the old one, same model, because my old psu kinda fried it...) doesn't have any feature turned on telling the computer to turn itself off every few hours. And I unfortunately, accidently, threw the box to the mobo out but i have all the other boxes to the stuff i got 6 months ago so a RMA is kinda outta the question... unless newegg doesn't mind me wrapping it in something and sending it to them. I don't know if the MOBO is defective... yet( I hope its a setting or something i overlooked) any suggestions?