When I plug it in via firewire it charges but won't sync or show the do not disconnect sign. When I plug it in via USB 2 it will sync but not charge. And it seems that when I plug it in with the USB 2 the battery drains like 10 x faster than normal. I have the latest ipod software, sp 2, and the latest itunes. This didn't happen until Apple sent me a replacement when my first one broke. WHATS GOING ON!!!!!!!!!!!!