I have the same problem with my 58 Galaxy, though I have had the car a year and it has been working fine until yesterday. I have ruled out the cable and the car (I think) as when I tried with my iPhone it all worked normally. I'm using an iPod Classic 160gb with a Ford Y cable and yes, you have to have the USB and the line n connected for it all to work. All was fine until yesterday, then the sound stopped working though the track shows as playing on the sat nav screen. BTW....has anyone found an easier method of scrolling? If you want a song, artist or album that is at the bottom of any list, it's impossible to get to it quickly unless you set up playlists in advance. I've not been able to find a way other than drive miles with your finger on the 'scroll' button, short of stopping and manually navigate to it on the iPod itself.