Returned from an out of town trip, the Prius started right up in the airport lot with no sign of anything wrong, but then I noticed the radio/stereo wasn't making any music. My wife and I had been listening to XM when we drove to the airport and the car hadn't been driven while I was away. Here's what's odd--making me thing it's an amplifier fuse issue--the MFD works fine. The MFD display shows the radio stations, XM, CD, Cassette, etc. tuning in just fine like it thinks it's playing music. But no adjustment of the volume (with knob or steering wheel controls) brings any sound at all (no static, nothing). I tried turning the stereo off and on again several times without change. I tried shutting the car down and restarting--no change. Anyone with experience with this? Is there a separate fuse for the amp? Is it weird that it would work when I shut off the car then not work when I restart it--or is that when fuses tend to blow? It was pretty cold out (45F) and the car was pretty cold soaked to that temp. But even when the cabin warmed up there was no change. Would appreciate advice.