I have a 2G iPod that came with a Firewire cable. I'm trying to use a USB cable (that came with my Nano) to power the iPod, but it's not working. I can use the Firewire cable with no problem, and can power then Nano using the USB cable. Am I missing something here? The iPod + USB basically doesn't charge but does connect to the computer, so it's like the iPod doesn't pull power from the USB. Any ideas?