Stereo Issue

[Beetlebum]

Hi struggling with my stereo, basically the unit in my Boxster s 2001 works, the phone works, the sat nav works, the trip info works and the AC works, the radio screen comes up but can't find any stations and the cd button does nothing, it also says no cd no cassette no radio, i've replace the two fuses in the D line in the fuse box, but still nothing, I've also taken both units out of the frunk and checked connections, what am i missing?
Thanks

 

[Chappelle]

Is it the double-din unit with integrated sat nav?

 

[Beetlebum]

Hi I believe so - it has sat nav / phone cassette - a/c
thanks