I've got a weird problem with my iPod. It won't play music, podcasts, or anything else I load on it. It's making sound--you can hear the clicks in the head phones. And it thinks it's playing the display shows the song dutifully playing with the progress bar moving along. I can even feel the hard drive spinning up as it starts to play. But no sound comes out.

I've checked the volume and looked through the settings. I've restarted the iPod. I've even restored it to factory defaults and reloaded everything. Nothing works. Given that it makes sounds for the wheel clicks, I have to believe this is a software problem, but I'm at a loss to solve it. Anyone have any ideas?