RNS D Sat Nav not working

[Colin]

The unit is fitted to a 2000 A8. It has worked well until last year when on start up it took about 10 mins to initialise. a few months ago I attempted to eject the CD but it got stuck and would not eject.
Since then none of the Icons on the Sat Nav screen were live except SETTINGS and EJECT CD. The other Icons were greyed out, everything elso on the radio and CD changer are fine. Could this mean the Sat Nav CD has died? Or is there some form of internal fuse in the CD that has blown?
Any help welcome. Maybe the best option is to fit an RNS E.