I need help please its a 2003, but the radio is a 2002 and the screen is black... The radio does work, but can not see anything except EXT with codes 50 & 51. I do not have the CD to be able to update the system does anyone have a file they wouldnt mind sending i noticed one gentleman here said he had one that he could send to anothwr member so i did reply to his forum just waiting to see if ge might possibly reply anything would help. Thank you
Bridgette

 

Sounds like the light bulbs are blown. Do a you tube search for videos to change the light bulbs. The screen is backlit.

 

Do a search on here of those numbers and you will come across the longest thread you have ever seen. The answer is in there.
Did you happen to hit something like a firmware update tab when it happened?