Hi, Last week, I received my new mobo and cpu upgrade: MSI S939 K8T NEO2-F V2, AMD Athlon 64 S939 3800+ (2.4GHz) 512KB (Venice Core) I threw out my old one and replaced it with the new parts. Everything else is the same (case, psu, mem, gpu, HDD) When installed, it ran fine, so I installed windows and drivers. While doing this the system shut down, never to boot again for more than 20 seconds, TOPS. After several suggestions, I disassembled everything to reassemble it again. It ran again for about 30 minutes, after which it shut down again and not booting up for more than 20 seconds once more. I went back to the shop with it, and it ran fine on their system for 3 hours. Although this would not be a 100% guarantee nothing's wrong with the mobo/cpu, it's still rather odd that it runs fine. I will list all suggestions that I have been given to rule out unnecessary posts. All of these suggestions resulted in the pc still shutting down after 20 seconds at most. - unplugging everything, except gpu to see if there's enough power for the cpu - putting in each ram unit seperatly (they work fine in previous sys) - switching psu, they're not all that fancy, but both resulting in shutdown while they work fine on my previous sys is rather unlikely - re-check jumpers, wiring, etc That's about it, I guess. My thoughts still go to some sort of power failure of any kind, but I can't really locate it, since I tried 2 psu's which both work fine on another mobo. Any help would be greatly appreciated.