E39 M5 monitor screen.. need help!

Hi, this is on my E39 M5.

My monitor screen is completely blank but does come up with the message "software required, insert cd". The sound still works from the radio for about 2 mins then goes off.

This all happenned when I was "playing" with INPA but not sure if I could have turned off the Nav system or not.

Anyone have any ideas... i'd really appreciate the help.

Dave

Unplug ythe nav computer... Then start it. What happens?

All functions except nav should work.