Out of nowhere for no good reason my G4 keyboard just crapped out. When I type letters nothing happens, the scroll arrows and other buttons work while surfing in Safari, but you can't type letters or numbers. If you press down on the letters, sometimes it will type out numerical digits like " 1 1 1 1 1 1 1 1 1 1 ......" I bought it used and I don't think I have AppleCare on it. Grrrrr. Any suggestions?