The message 63F7A21F1CA18143AFDBF28E2A7D6BBAE5E132@endor.kewill-europe.com from "Keith Watson" keith.watson@kewill.com contains these words:
I had to close Debian down before the CD drive would operate again.
This happens to me every now and then. I find that opening a command shell and su'ing to root then issuing "eject /cdrom" (or whatever the CD mount point is) usually works.
The words have a familiar ring to them - but I'm not up to speed at using terminals yet, so...