A friend's 20" iMac G4 has been going really slowly of late, so I went over there to try to sort it out. Intending to do an fsck, I restarted with Cms+S: it just restarted as usual. So I thought I'd try zapping the PRAM. Held down Cmd+Opt+P+R, restarted. One "bong" and it went into an ordinary restart. WTF? Keyboard seems OK, I checked with Keyboard Viewer that the right keys were registering. Is this really odd? Never happened on any of my Macs.