I have 3 PC's that all did the exact same thing. Each one was working, and then froze. Once a hard boot was done they all come up to a black screen with only a mouse cursor. Keyboard works fine in the bios screens, but cannot load into regular mode, safe mode, safe mode w/ networking, etc. without getting the black screen with a movable mouse cursor. They are all running Windows XP Professional, and when I attempted to do a repair installation it will copy the files and reboot, but on reboot it goes back to the black screen with a mouse cursor. Any help will be greatly appreciated.