2009 cayenne, never have had a bit of trouble with it. Started car after work and radio was silent. Everything lights up and will switch channels. I put a CD in the player and it would not recognize it. Mid afternoon I went out to the car and put a route in the nav but I can't believe that this had anything to do with it. Any ideas?
thanks

 

Took out the 2 fuses to check them with a VOM and they were fine. Put them back in and everything works. Some sort of reset mechanism, I assume.