MP3 player seem to be frozen

Question

When I turn the mp3 player on a display screen comes on and it stays on there. There's no sound, the removable disk will not come back up on my computer.  The battery life was good.  I had made one of my pictures a wallpaper but I didn't like it so I was trying to take it off when the mp3 just cut off.  Now when I turn it on it'll just show the river with the sun rise display screen. It will not go off. It will not charge.  Its not working.  What do I do?