Audio Systems: 2005 GMC Envoy - Bose 6CD radio, led lites, blind mode

Question
You seem very knowledgeable in these systems.  After a battery change, my Bose 6CD Stereo  still plays fine, loads OK, changes Bands OK.  BUT, NO PANEL LITE, NO LED LITES, NO LITE AT ALL FOR THE READ-OUT.  Therefore, control is in blind mode. Any idea??  Separate Fuse?? Easily fixed???   Advice appreciated.

Answer
THANK YOU
EJECT the cds and remove one battery terminal again to reset the radio

sometimes it works again  if not the radio needs to be test outside the vehicle  

2 problems can happen bad radio lcd display
or bad illumination dimmer controls, this is not inside the radio

good luck