I have an older Gateway (P4/1.6 gHz) system that I was using to test some old video cards that I was trying to sell on EBay and all of a sudden, the system would not boot up. Now, I used to be a hardware tester, so I know how to easily install/remove components on a PC. But now, it doesn't boot into BIOS or anything. It powers on and the fan spins, but nothing else. I have tried unplugging everything and plugging it back in, but nothing seems to work. Does anyone have any ideas what could be wrong? Any other info I can give you? I'm thinking either bad power supply or fried the mobo. Any help would be appreciated. Thanks