So a guy at work brings me a computer that will not do anything. I opened it up and it was filthy inside and had 9 blown capacitors. It was a HP Pavillion desktop running Vista. I decided the best route was to buy a used motherboard on ebay and switch it out. The motherboard was a MCP61-HM. Got the board and switched everything around and fired it up....first thing I noticed was when I plugged in the power cord, all the fans came on and running at full blast. When I pushed the power button, everything settled down and the machine fired up. After removing 22 toolbars and cleaning up 2500 or so infected files the machine was running good. I used it for about 2 weeks and then got it ready to take back it's owner. Unfortunately, he was fired and I've never seen him or heard from him again. Pulled the machine out of the closet tonight and tried to fire it up. It tries to let me chose between safe mode and the like but will not seem to boot. Goes into a loop. I can see a BSCOD just before it clicks and tries to boot again. I can get into the bios, but nothing seems to help. I put in a hard drive that I know works with the same results. I still get the crazy fans when i hook up the power cord, but when I push the power button it settles down. Not sure where to go now.....any suggestions would be greatly appreciated.