Hi. I'm very frustrated with my iPod Nano right now. It hasn't been charging or syncing to my MacBook or any other USB 1.0/2.30 computer in this house. The cable works fine, and I've tried it with other cables, too, so it's the iPod's fault, needless to say. When I plug it in, it only tuns the backlight on the screen. It doesn't sync or charge or charges extremely slow without any indication. When plugged into a wall charger, it charges just fine for some odd reason. I've reseted the iPod a million times and gone through the diagnostics menu a million times. I can't figure this out!!! Please help!!!