I've never had a problem with this before, but today when removing my mobo and putting it back in for an XP-90C install, my external USB slots are malfunctioning. I was pretty sure I plugged them in to the right spots, and have tried many different configurations now (note that my cords for ext. USB in my case are not all together in one neat block, they are seperated in two peices: ground, and USB connection). The CMOS did reset itself when i removed the mobo, so are there any settings I need to change? I have it at 8 USB devices, and Full Speed, with USB 2.0 enabled, Legacy disabled. Should I change anything? If you have a P4C800-E Deluxe, how are yours set up?