mercedes e250 10 plate sat nav 20 problems

[kenc543]

hey recently bought a e250 2010 model problem is the sat navigation 20 is stuck everything I put it on just the picture of sat nav 20 comes i means I can't use the aux to play my own music either anyone got any ideas for a quick fix?

 

[markjay]

Hard reboot - pull the Audio 20 fuse, see what happens?

 

[kenc543]

where is that?