Picked up a broken Nano 2nd gen 2GB to mess around with, and it wouldn't charge, show any signs of life, or get detected by a computer, whether PC or Mac. I installed a replacement battery, and now a PC or Mac will react when it's plugged in, but the screen still doesn't light up, or show any image. Also, when in iTunes on either my Mac or PC, a message pops up that says "iTunes cannot recognize this iPod at this time.". after dismissing it and pushing any button with the hold switch off on the iPod, the message appears again. There is still nothing that appears on the screen, even though it visually appears unbroken. Any ideas on how to fix this?