Radio locked and not asking for Code

[Angry]

Hi,

Have a 2008 Micra with original radio and cd player.

Changed the battery and now the radio turns on, display lights up, but does not ask me for the radio code!!!

 

I have the code, but the radio display just stays blank, and does not ask for the code.

 

Is there anyway to reset, or cue the radio to ask for the code?

 

Thanks