md1twal3,
Sorry I may have replied in hast.
I looked over the service information and basicalliy the same applies. It appears that for some reason the player cannot detect or read the cd. If you are trying to read a cd that you recorded, the cd player may not be able to read it, try a different CD.
I also found two TSB's that state trying to play a cd with wrong format will create problems, see below.
TSB DVD Player Inoperative - keywords disc display entertainment movie #PIT3248A - (01/11/2006) and Info - Compact Disc (CD) or DVD Player Skipping, Inoperative, Sluggish and/or Long Search Times #05-08-44-001 - (01/24/2005)
DVD audio discs are another high resolution sound medium that is offered to the consumer. This format is NOT compatible with a CD player or a conventional DVD Video player such as those offered by GM. The exception is that recently, some manufacturers of DVD-A discs have begun producing two-sided DVD-A discs. These discs may be labelled DualDisc with an accompanying symbol. Only DVD-A discs with this symbol will play in your GM CD/DVD.
Sorry I can't be of more help, if you have tried differed CD's, then I suspect you will need to remove the player and send it out for repairs.
Good luck
