ok so i custom built my computer a while back. 
msi mobo nvidia chipset.
nvidia 8600GT V-card.
2GB ddr2 ram.
intel core 2 duo
and other poinless to mentions.
i have run EVERY OS there is on this computer but settled for Win 7 few months ago. well i left one day came home and my computer was off?? i had left it on before leaving.
when i turned it on it booted up fine. got to my desktop then shut off instantly like overheating. then kept doing the same shutting off instantly for no reason. i re mounted the heatsink new fan just to be sure it wasnt overheating. still shut off for no reason. then i thought hmmm maybe OS is messed up. whiped one HD then tried to install win 7 again. get mostly through it and it shuts off again. i cant figure out why i ahve tested over component. ram CPU PS HD everything it will stay on all day if i just sit in the bion setup menu but when i try and use it EX. install OS boot OS it will shut off randomly at diff points each time sometimes it will take 10 min sometimes 1 min others 7 min its completely random.....
HELP!!!!!!!!!!!!!!!!!!!!!
				
			msi mobo nvidia chipset.
nvidia 8600GT V-card.
2GB ddr2 ram.
intel core 2 duo
and other poinless to mentions.
i have run EVERY OS there is on this computer but settled for Win 7 few months ago. well i left one day came home and my computer was off?? i had left it on before leaving.
when i turned it on it booted up fine. got to my desktop then shut off instantly like overheating. then kept doing the same shutting off instantly for no reason. i re mounted the heatsink new fan just to be sure it wasnt overheating. still shut off for no reason. then i thought hmmm maybe OS is messed up. whiped one HD then tried to install win 7 again. get mostly through it and it shuts off again. i cant figure out why i ahve tested over component. ram CPU PS HD everything it will stay on all day if i just sit in the bion setup menu but when i try and use it EX. install OS boot OS it will shut off randomly at diff points each time sometimes it will take 10 min sometimes 1 min others 7 min its completely random.....
HELP!!!!!!!!!!!!!!!!!!!!!