I just built my computer today and every time I power it up, it turns itself off after a short while. I don't even have time to go into the BIOS. What could the problem be here? I have a p4 2.4c w/HT, ASUS p4p800 deluxe mobo, sapphire ati radeon 9500 with 1 gig twin x corsair pc 3700 ram. One more note, the longer I leave the computer off, the longer it will last when it turns on and when i take the processor out, the computer doesn't turn off. So what problems could there be?