If you take off the metal cover on the cd-changer (just a few screws) you could manually turn the white platic gear (using a screwdriver) and the casette should eject. I had the same "no disc" error...had to buy a new cd-changer...I bought a remanufactured one from the dealer for $150 with my core.

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2010 BMW X5 ///M
Silverstone Metallic
Black/Black Merino with Black Piano Trim
Premium Sound
Driver Assistance
Comfort Access
High Gloss Roof Rails

Gone but not forgotten: Upgraded!
2003 BMW X5 3.0i
Titanium Silver
Navigation
Cold Weather Package
Premium Package
Heated Steering Wheel
20" wheels (275/45/R20 all around)
Supersprint Magnum Exhaust
AFE Cold Air Intake
Bimmian Chrome Guage Rings
What's A Resonator?