HELP! (I'm having to type this on my 300MHz notebook). Yesterday, my second power supply in 12 months bit the dust. I spent all afternoon today cleaning any dust out of my PC (it wasn't too terrible, but I thought that might be the cause) and replacing the PSU. The computer fired up, but I immediately started smelling that same odd (like burning plastic) smell. Less than a minute later, the psu died... litterally in a puff of smoke. It was also very hot to the touch immedately after. Now the technical details: A year ago, my 400watt psu blew. Suspecting I was putting too much of a drain on it (Athlon XP 3200+ cpu, 4 IDE devices, but no lights or fancy stuff), I replaced it with a new 550watt psu. Flash forward 54 weeks later to yesterday, I suddenly smelled that burning smell, followed soon after by the PC's power failure. Today I found a replacement 550watt psu... used but in great condition. As noted above, it ran for about one minute before dying in a puff of gray smoke. I have no clue what is going on here. Anyone? HELP!