radio display won't light,radio works fine

The illumination screen has failed but the stereo will have to be removed to repair it. Many companies specialize in repairing original equipment stereos, google " Pontiac original equipment stereo repair" see who is local to you. http://www.carstereohelp.com/strpontiac.htm

it could be a fuse check it and if they are fine then it might just just be the radio