Ever since I installed xp, anything I put on a usb port runs for a bit, then shuts down. Went out and bought a new chip and motherboard first. No help. Updated all the drivers for everything. No help. Been on technical support with Lexmark. No help. Called the place I got the chip and motherboard. No help. Tried plugging my explorer mouse in the usb. Locks up after a bit. Tried my lexmark x 83 printer. Locks up after 1 whole minute. Tried my son's HP printer. Locks up after 10 minutes. Have tried both usb ports. Both do the same. As long as I use the adapter for the mouse to make it a ps/2 I can at least use that. Still no printer, and I need this printer/copier/scanner for my stable business. Help please!