Alright, I checked a few threads here before posting and tried a few of the things I found in them before posting... So here goes. System is DIY. Mother: Biostar P4M800 Pro-M7 Socket 775 w/P4 3.8Ghz Case came with 450W power supply. 1.5G Ram (DDR2) Couple fans 7.1 Soundcard (Auzentech) Last weekend, I installed an ATI Radeon X1950GT Super 3D Graphics Card. This immediately resulted in overheating problems, and eventually the system wouldn't so much as boot up (CMOS set to shut down at 80C). I finally decided to give it a rest and went to bed. The next morning, it booted fine, so I logged into CMOS, set the fan to alternating speed ("Smart"?), then went downstairs (don't smoke in the house; kids, y'know). At any rate, when I came back, the system had shut down. At this point, it wouldn't reboot at all. Frustrated, I started taking my system apart; I wanted to check the motherboard for anything that looked like it might be burned, scorched, melted, etc. However, about 2/3 of the way through, I found an oily substance on one of the cables. I traced this to the power supply, which I then removed and opened. Sure enough, there was a component that had melted and some of this fluid had leaked (am I gonna get cancer?). So, I ordered a new power supply (500W) and dual-fan system that slides into a 5.25" slot for good measure. Arrived this morning. I installed and fired it up. And it ran for all of 10 seconds. Since then, when I hit the power button, nothing happens. If I unplug the cord from the power supply for a few moments and then plug it back in, then the fan kicks on for just a split second after hitting the power button but then stops. Since then, I have cleared the CMOS twice, removed all hardware except the C: Drive and RAM... So, this being all the relevant information that I can think of, does this sound like a fried board, or is my problem elsewhere?