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Does the DVD drive work if you try to play a music CD?
If you can't get a CD or DVD into the drive, I'm afraid to DVD changer inside has broken. It is common on this type of radio, the only way to solve the problem is to get a replacement unit.
I know the dealership offers remanufactured radio units that had the built-in DVD changer, but I have to wait until tomorrow to get pricing. If you could post your Vin number I can get a better idea