You might try disconnecting the radio module and reconnecting it. Or, disconnect the battery, let the car sit, and then reconnect the battery.

The CD player in the screen should identify itself to the radio when everything powers up. Maybe that identification never occurred, and the radio still thinks that it is communicating with a tape unit. In come cases, the component self-identification (DSP, TV module, Telephone, etc.) cleans itself up within a short time. But, maybe the radio/CD relationship needs more encouragement.

__________________
SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input