Same thing happened to me 3 weeks ago; my truck would not move forward and will not give me back the key, it was towed to the dealer and they replaced the ignition switch. When I got the truck back from them the next day it was working fine but the CD player (in dash 6) would not play, full with 6 cds will tell me that there were no cds and sudenly it appears the INITIALIZING memo on the lcd, is there for ever and nothing happen, I have an appoinment at the dealer tomorrow to check it out. I will let you know what happen. 
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"2003 Sage green LUX, wrapped around brush guard with off road lamps, roof mounted SMA light bar, AirAid Jr. kit, Delphi Touchscreen Navigation Radio with a 6 CD changer and more! Also a member of the HOPE (Hummer Owners Prepared for Emergencies) pro
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