It was an Antec Smartpower 500W...I'd had it about a year and a half. Went to turn off my computer and as soon as I hit "Shutdown" in Windows there was a loud pop and then the power LED on the front of my system faded on and off (along with the fans). After shutting it off the "burnt electronics" smell came and I found out afterward it wiped out my motherboard, two hard drives, and a DVD writer. I never got around to checking if the CPU and memory were still good. The system wasn't even loaded hard. The PSU was powering a P4 670 at 4GHz, 4GB 533MHz memory, PNY 7600GS, WD Raptor 150GB, Seagate 7200.9, and a SB Audigy 2. I paid extra this time for the Corsair, after reading it uses good capacitors. We'll see I guess...I'm terrified to lose everything again...haha.