I am wondering if there is any way to power my digital back through my firewire port.
The original firewire spec includes a power pair, but subsequent innovators took it away. If you have a six-pin firewire port on your 'puter, it should deliver power. That's the largish socket with an inner tab. But if yours is the four-pin, no power. Thank Sony for that.
The description of this hub
leads me to think it might do what you need, although you may need to add a four-pin to six-pin cable to connect with the 'puter.