My sound for the radio went out on start up and can't get it to work ??? Are there fuses for the bose sound system ? And yes i don't have mute button on

 

that happends to my Bose sometimes, but it works fine the next time i start the car up... this has only happend to me 3 times...

 

The same thing happened to me yesterday. Could be the cold weather. My best guess is that it's the link between the HU and the amp. All of the functions seemed to work, but there was no sound. It worked fine on the next startup.
Occasionally when I start it up it just displays 'Porsche'. I have found that if I press the CD button and then the FM butoon it will start working again.

 

no i think the AMP just Stalls, when you Turn On and Off the car it Resets... i think