My iPod Mini is about 8 months old -meaning still under warranty- and it has been working fine, until now. I just plugged my iPod into the computer because it was completely dead - or so I thought. I plugged it in to the USB port and an iPod with Xs on the eyes and a sad face comes up, then after approx. 5 seconds the charging battery shows up but doesnt move. I removed it from the USB cable, and the screen is blank. I've tried resetting it, and other USB ports.. What's wrong? More importantly, what can I do?