2004 yukon bose radio problems

recently bought an '04 yukon with the bose radio system. the radio plays but i have no display. Also, it has a 6 disc player but it will not accept a cd either. i have to use the steering wheel controls to change the stations becuse none of the buttons work on the radio and volume its very aggrevating. I have disconnected the radio with hopes it would reset, also took the top cover off to see if there was an obstruction but nothing. i was going to replace it with an aftermarket radio but was informed i would lose some of the fuctions of the system like steering wheel controls and any amps associated with the bose system. its not the dimmer light either. thanks inadvance for any info!

2seven