Recently I was at a friend's place and I took my iPod Nano there. I had it in my pocket and was using it throughout the day. I then turned it off for about 2 hours and when I tried to start it back up it came up with a white screen and it's make loud beeping noises every time I pressed a button! I then tried to run the battery down, which I did and when I charged it, it happened yet again! What should I do?