I'm putting together a system for my Aunt and its having some problems I can't figure out. Motherboard: ASRock 775-VSTA CPU: Pentium D 805 2.66Ghz RAM: 512Mb Corsair Value Select DDR2 HD: WD 160 Gig Vid: ATi 9600 Pro DVD: Some Lite-On Burner PSU: Antec Smartpower 350W What happens is I power on the system and the cpu fan and case fan spin for about .1 seconds (yes that short, not a few seconds or 1 second). I pull the power completely and let it sit for a while and then it might boot. Once its running as long as I don't shut down or hit the power switch it seems to run indefinately. I can reboot and it still works. Just can't shut down. I'm thinking perhaps its a bad capacitor on the motherboard but I'm not 100% sure. There are a few other problems that may or may not be related. I originally put it together last weekend, and forgot the spacers when installing the motherboard. The system was powering on and shutting off about 2 seconds later not long enough to post. So I thought maybe it was shorting out (after I realized I forgot the spacers). I put the spacers in and was intermittenly having the same problem, then got to thinking it might be overheating and thermally shutting down. A check on the heat sink showed that maybe that was it, only 3 of the 4 pegs were completely through the motherboard. I got the system to boot though after playing with the heatsink a bit, but bios was reporting cpu temps in the low 60s (C) so I turned it off. I've had a pretty busy week outside of computers so I didn't mess with it all of last week until today. I found out the heat sink problem and applied some cheap thermal paste I got from radio shack (after scrapign off the damaged thermal pad that came with the hsf and processor). When I was able to get the system to boot I began the Windows install, after it formatted the 160 gig right after 100% it said that it was unable to format. So I rebooted with the WD disk in and then the DVD drive was toast, drive would shake like it was off balance when spinning up the disk, and made some wierd noises when trying to access. So I had to hook up another burner I had to install Windows. Windows then installed fine and worked, processor temps are pretty hot, I can't tell what they are because I can't find any software to monitor on this motherboard. It did lock during a burn in with Sandra running processor and multimedia tests, but it will finish single ones without locking - I am pretty sure that that is a CPU temp issue.. So is this a capacitor on the motherboard issue? Is this a power supply issue? Am I just having incredibly bad luck? What next?