None of them do their functions, even the num lock key doesn't light up. I Verified and repaired permissions, that didnt help. All the computer does is make that error "ding"... What's wrong here? 
EDIT: Expose (F9), F10, F11, and Dashboard work. So does eject.
EDIT: Expose (F9), F10, F11, and Dashboard work. So does eject.