I recently put a bunch of movies on my iPod (about 12 GB worth, 17 movies in total) in preparation for a tour with a lot of long bus rides. A couple hours ago, we arrived at our hotel, and I left my iPod in my backpack when we left to go eat. I just got back and pulled it out, and it's making a clicking sound like the hard drive is reading a file and the screen is flickering white on and off very quickly. Anyone have any idea what's going on? (Is my iPod bricked?)

EDIT: I've tried turning hold on and off and holding the play+select buttons down with no effect--plugged into a computer, unplugged. It doesn't show up in itunes either.