Help me please! My mp3 player shut off.

Hi, I just got a brand new sandisk sansa e250 mp3 player for christmas. I didn't charge it all the way, because it had almost full battery when I took it out of the box. It worked fine for about 1 hour. The battery was about half full when I pluged it in to be charged, I left it there for about 30 minutes and when I upluged it to listen to music the screen froze on "Disconnected" and wouldn't go to menu or anything else, then it shut off and it won't come back on. I tried: 1.Taking out the battery and putting it back in two times. 2.Resetting it. 3.Letting it sit for a while. If here is anything that would help please reply.