Did iSight blow up my firewire bus?

I was using ichat the other night when suddenly the video disappeared. the light on my isight camera went out and it was non responsive. When i went into system profiler it said the firewire bus was not there.
I shut down and tried again, no luck. I pulled the camera and tried the firewire port on the front, and it did work, but it will not on the rear.
Is it time to just bite the bullet and take it into the apple store, or is there anything else I can try to resurrect the rear firewire port?
I would think if the entire bus was fried neither port would work, but what do I know...

I was running an IO Gear firewire hub, and wonder where the problem is. I pulled the cable from it, and tried that with the isight, nothing. however the isight WILL work on the rear port with its own cable.
I am assuming the problem is actually in the cable that came with the hub, rather than the hub itself, but am holding off on testing the hub for now.

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