ISight only works when it's the ONLY firewire device?

I have connected the iSight to both the firewire 400 and firewire 800 ports. It only works when it is the only device connected to the port.
If I connect it to a hard drive, it works if and only if the hard drive is off. When I turn the drive on, the iSight ceases functioning. When I connect it to a hub, it works if and only if there are no other devices connected to the hub that are on.
Is there a trick to getting the iSight working with other devices?

 Some devices are tricky for me, too. Possible hardware or software conflicts

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