Hello all - I am at my wit's end with this! I have a custom built pc running XP Pro and suddenly the keyboard and mouse stopped working. I've tried replacing them (one at a time and both together) and I've tried using USB mice/keyboards and nothing will work. I've tried all the USB ports, front and back to no avail. So I am completely stuck - I can't get into the BIOS or anything. Any ideas would be GREATLY appreciated!