One of my computers has quit on me and I dont quite know where to start looking as this has never happened to me before. The computer power light will come on and it will run for just a few seconds then shut down. Both the cpu fan and the power supply fan come on when the button is pushed so I dont think overheating was the problem. I havent a clue where to start as it wont even get to the boot stage. I have removed all add-on hardware and it still does it. Any ideas?