Buttons are nonresponsive

Just got this delivered today. I have loaded music into the unit, and the track title runs across the screen. But when I push play, although the play icon shows in the top left corner, it doesn't play. The volume button is not working. Once in a while, the volume indicator moves up a bit and I hear a couple of seconds of the song, but then it slides back to the left and stops playing.

Any suggestions on what I might do? Returning to Amazon is a real bear. If I can get it figured out myself, I'd like to. But if it's hopeless, I'll have to face it.

Thank you.