new ipod nano(5gen) won't turn on

So I got my new iPod Nano(5th generation) a few days ago. I put it in the computer to charge, it synced all the music to it, I eject it from the computer and the screen flares up with all the music and everything, but the moment I disconnect it from the usb cable to the computer the iPod goes off and I can't turn it back on. I tried the hold/center+menu thing, it doesn't work. I left the battery to charge, it still won't turn on. I am not sure what else I can do, it simply won't turn on unless it's connected to the computer.