Happened to mine...... It's dead Jim.
Sometimes cycling through the Eject/Load cycle going from CD to CD will get it to eject though.
Gotta have it replaced if under warranty. The dlr will ship ure CDs back to you. Just stay on top of them. It takes like 6 weeks to get em back. They'll swap out your player in the meantime for a refurbed unit & u have the remainder of ure warranty on that one. If u r out of warranty hit Crutchfield's and get a replacement unit & the proper mounting stuff (comes with thier units free). But I don't know how you can recover ure CDs short of dismembering the unit. Evidently the 6 cd changers are pretty crappy units as I have seen alot of failures reported on here. Nice for $600 or whatever it is the option costs.

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My pics!!'03 Rennie w/all Tupperware
Custom Roof Basket
Mopar Tubular Brush Guard
Garmin GPS V & Laptop w/Nav software
RAM products laptop mount
Maglite w/mount
Rear cargo bay tool cabinet
AllJs Rear Shelf
Rear receiver
250k miles!
LOST #CR051230