Something's seriously wrong. The mac in most applications repeatedly makes the noise it would make when you hit a keyboard key when you're not supposed to and you get a medium key-tone. When I hit alt-tab, it scrolls through the options at rapid speed, going through the open programs over and over until I click out of it. However, I can use apps and type normally, there's no indication that any key is being pressed. Just the rapid-fire beep noise of a key being hit when it isn't supposed to. However on some password dialogs when i try to type a password, the box fills up with keypresses (the little dots of hidden typing). The problem exists in all my user accounts. Sometimes when I reboot the problem goes away for a while then comes back. Any ideas? Edit: in MS Word it keeps doing a grammar check over and over as I hit enter. The keypress for that is command-shift-L. Hmm.