I had the same problem on my 6006e radio in a Focus. I just tried holding in the load or eject button on the CD and eventually the CD ejected. After a few months, it did it again, and this time my trick wouldn't work. I took the radio out, took the cover off and found a broken plastic arm. I'm now looking for a replacement unit at a reasonable cost - ebay units seem to go for about £100.
Robert Davey, September 2007