New situation, not sure where I should start on this problem. Have a system on hand with a Gigabyte i845 P4 motherboard & WinXP Home, and when I get to the logon screen, I can move the mouse around all I want, but as soon as I click on the username to enter in the password, both the mouse & keyboard stop responding. The system is not locked up because hitting the power button goes through the proper shutdown procedure. This happens in safe mode as well as normal mode. I have a Gigabyte i845G P4 board on hand, but the drivers do not work out and swapping motherboards causes a crash on bootup, and thus I cannot determine if it's a bad motherboard or bad Windows configuration.