[HELP] Keyboard "beeps" on every letter pressed
My MBP keyboard is behaving weirdly on every application. Whenever I type a letter, the system "beeps" with the system alert sound (whichever is chosen in SystemPrefs>Sounds>AlertSound), once for every key pressed on the keyboard. Very annoying! It only happens with letters and numbers, the rest of the keys (F-keys, tab, shift, ctrl, cmnd, fn, enter, return, etc... ) don't "sound".
I tried to find a setting I might have triggered "accidentally", but couldn't figure anything out. I restarted and it's the same.
Any ideas?
TIA
MacBookPro, MacBook, PowerMac G4, eMacG4, iBookG4 & iMacG4, Mac OS X (10.5.3)