Stereo not working?

Searched a fair bit on here, couldn't find a similar problem to mine...

I have recently taken out the battery and put it back in, straight after starting it back up again, the stereo would not work. It won't turn on however the time and temperature still shows on the HUD. Normally I have experience of just needing a radio code but of course it will not turn on to prompt this...

Checked the fuse, looked unbroken as far as I could tell. Any ideas?
 
Switched ignition? Is that fused by any chance. There will be a wiring diagram on Wikipedia just search "ISO 10487" that is off course you have access to a multimeter.
 

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