BMW 318 STEP (2000) - CD Multichanger ?

I have an error message "No Magazine" on the in car display. This appeared after I tried to change the disc that was playing. The 6 Stacker is located in the boot and the green button on the left of the unit is failing to eject the unit containing the CDs and seems dead. Any suggestions gratefully received, with Thanks

Malcolm Edge
August 2009