This error, like phoenix 4-2-3, can be caused either by keyboard problems or a bad problems or a bad motherboard. A rare handful of keyboards have a fuse; check to see if it needs replacement or resetting. Try a different know-good keyboard to see if it solves the problem. If the keyboard seems okay, AMI recommends reseating the keyboard crontroller chips if it is not solvdered to the motherboard. If it still beeps replace the keyboard controller if possible.