The CD changers offered by MB are notoriously unreliable, finicky and proned
to problems. Two main things I see preventing the magazine cartridge from
ejecting is

1) CD tray is extended into the changer and unable to retract, for
some reason. Disassemble or send to some MB changer specialist like La Jolla.
Oh yes, you should be able to look closely and see one or more of the 6 trays
in the open position if you look into the gap to the right of the cartridge.

2) is that the carrier bracket surrounding the 6 slot cartridge is not lined up
precisely to the opening. When the EJECT button is pressed, the motor whirls
and tries to push the cartridge out but encounters too much resistance. In this
case, you use you finger/nail and flick the front edge of the cartridge upwards
in hopes of assisting the cartridge into a more favorable position.

If I had a cost effective way of converting to MP3 player, I'd do it in a blink.
These Mickey Mouse changers are the pits.

__________________
-- raymond~
47º 34'N 122º 18'W