My machine will not post to bios, nay even beep. The trouble started when I plugged in a Sony Vaio Pocket VGF-AP1 20GB MP3 Player in a front USB slot. During operation the player (slot) stopped working. After I shut off my machine, it won't boot or post. I check the power source, RAM, and USB connections: all good. Also tried clearing the CMOS. Still no go. Any ideas or suggestions?