Ok. I have an Aspire full-atx case with a Turbolink 420 P/S. My mobo is a P4P800-E Deluxe for Socket 478 P4's. Now, the first incident was when I plugged my MP3 player into the front USB port. I start to smell a burning, and it starts coming from the computer. I look in, and the southbridge chipset has a hole in it. Replacing it with the same motherboard, I plugged my digital camera, and the same thing happens, except there is no physical damage on the motherboard, but it won't POST. Now I'm wondering wheter or not this could be something with the case, the front USB ports, the USB cable, power supply, or anything. Here are my total specs:
Aspire Full-ATX case w/ Turbolink 420 Watt P/S
Asus P4P800-E Deluxe Motherboard
PQI 512MBx2 DDR400 Ram
Pentium 4 @ 3.0 Ghz with HT
Sapphire ATI Radeon 9550 256mb AGP 8x
Seagate Barracuda 7200.7 200gb SATA HD
Chaintech AV-710 7.1 channel Sound Card
Windows XP Pro w/ SP2
Arctic Ceramic Thermal Paste.
AOpen 16x DVD-ROM
Optorite 52x CD-RW
Stock Heatsink/fan combo
Samsung 712N 17" LCD monitor
Logitech MX510 Gaming Mouse
Logitech Z680 5.1 Speakers