Car is a 2007 Audi S4 with Bose system. We all know that audis can have some electrical problems, I was crossing my fingers hoping that I'd never cross one, but my luck has officially run out. The other day, I drove to the gym, listened to the radio just fine. After the gym, I get in the car and turn on the stereo and nothing. The car has navigation, which the radio/stereo is hooked up to. There are no codes, the nav screen says its playing the radio, cds etc, I can switch cds just fine, just no sound out of the speakers. The past couple times I've gotten in the car, as soon as I put the key in the ignition there is a pop that comes from the speakers. Today, I swear I actually heard the radio for a tenth of a second, then pop then nothing. Any ideas wtf could be going on?