I have a problem with my newly assembled PC. Problem is it will not boot, when I turn on the computer it starts up but shuts down immediately. First I thought it was the PSU (Antec Phantom 500) I had it replaced but the same still happened. I tried disconnecting everything, only power, mem and CPU, would not boot. At last I clearing BIOS, and that helped, but next day when the computer had been turned of for the night, it would not boot. Yesterday just before shutting it down in Windows I started getting these program failures, e.g. starting FireFox it would do an unhandled exception or something, had similiar problems after installation of WinXP, so I had to install like 3 times, but I do not know if that has something to do with the actual boot problem. My setup: M2N SLi Deluxe AMD AM2 4200+ X2 2xKingston value RAM DDR-II 2xSamsung Spinpoint 160 Gb RAID ASUS GeForce 7600GT Silent Antec Phantom 500 PSU Leadteak/ASUS DVD Drive 3½ Floppy Zalman CPU cooler Antec P180 enclosure