I have a first gen ipod nano that it having some problems. It has worked for a while now, and then yesterday, I plugged it into my computer to charge it, and it worked fine for the rest of the day, but today, I tried to turn it on, and there is no sign of it working or anything. I tried plugging it into my mac, and it does not notice it. Does this mean that the battery is dead? Or does it mean that the screen is mad or something? Thanks for the help.