so here is the thing, my N900 stopped vibrating whether when i touch the screen or when recieving calls. i really dunno what happened, it fell 4 me once but it was fine and all of a sudden it stopped making vibrations so any idea how to restore the vibration?!

P.S: i checked the settings and the vibration is set on ON and i rebooted it several times and still no use :S

PLZ HELP