Okie, I've got a MSI KT3 Ultra-2 C w/ AMD Athlon XP 2200+ and 512mb DDR and GeeForce2MX Today I was working and my computer just shut off all of a sudden. No shutdown, no freezing, no system halting. Nothing. Just the power turned off. I turned it on again and it proceeded to work fine, but after about 20 mins it did it again. I tried starting it again and it got to just before Windows boots up and shut down. I repeated this proccess a few times and it got to just before windows finished loading and it shut down. I opened up my case and felt the heat sink and it was pretty hot. I figgured it might be because of the heat and MSI's CPU Thermal Protection, so I let it cool for about an hour. I tried it again when it was cool and this time it stopped right after OS Boot. So I try again and it does it just before the os boots. Now everytime I boot i start it up, it stops before the os boots. I thought it might be windows, so I unplug the hard drives, and no change, reboots in the same place. Not even a "Operating System Not Found" message. My MoBo came with MSI's D-Bracket that has 4 LEDs that show the status of the sytem as it boots. If there is a problem with the proc or ram or something, the combination of LEDs would tell me. But that reveals nothing. Anyone have a clue what is happening?