I have a 2002 Disco, the guy before me never used the radio and now I want to. Called for the code and got it, the issue is the radio is not showing or asking for the code. The only light coming from the thing is the red blinking navigation light. Any ideas on how to get thid working

 

Leave the radio powered up for most of the day, then turn it off and back on, should get a request for the code. If not call the dealer and ask them.
Mike