I was having trouble with the system crashing intermittently with the HP mentioned in a previous post. The file HP said to rename ended up disabling all of the USB devices (including the mouse). Turns out, the scanner/fax/printer had developed a problem with it's scanning capabilities. Solution: swap devices with a station that doesn't do scanning.

Original Thread quoted below
"You may want to go in the bios and clear the nvram so it will be redetected. make sure the caps lock is on, scroll lock, and num lock then alt e, alt f alt b. and make sure jumpers are set to cable select. It should not matter if it came from a gx240. Also check to make sure it is rec in bios."

F2 is setup on most Dell systems