Audio Systems: LED Display quit working, pontiac grand prix, magic button

Question
Why did the LED display mysteriously quit working on our Monsoon audio system (2004 Grand Prix), and what can we do to get it working again? This happened once before and our son pushed a button and got it to come back on but we cannot seem to find that "magic' button again. The stereo system seems to function properly even though we cannot see the station or E-Q data. Please help
Thanks

Answer
there is no LED on this radio it is a bulb behind the display
this light needs to be replace

http://cgi.ebay.com/PONTIAC-GRAND-PRIX-DISPLAY-LIGHT-BULB-RADIO-CD-PLAYER_W0QQcm...