iPod classic 3rd gen only recognized over USB, not over FireWire

iPod classic 3rd gen only recognized over USB, not over FireWire
I have an iPod classic 3rd gen that I have in disk mode that I need to restore to get working again, but iTunes and disk utility only recognize the ipod when i plug it in with USB, and It says connect to firewire to restore, which i cant do as stated above. Also, when I format it over usb in disk utility and then click update, it says plug into wall charger to complete update, but when i plug it in, nothing happens. Help!

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