Imac G5 won't start with Isight plugged into the firewire port.

I went to turn on my Imac today and it wouldn't start. After checking all the usual culprits (power strip, outlet and power chord) which were not the problem, I proceeded by unplugging all the external devices from the back ports. After unplugging the computer for a few seconds and plugging it back in (which I read resets any power issues), it turned back on. I plugged my Isight camera back in and turned it on and the computer suddenly shut off. I reproduced this quite a few times and it did the same thing. It won't even turn on if any device is plugged into the firewire port. Does anyone have a clue of what this conflict could be or experienced anything similar.
I would greatly appreciate any input.
Thanks in advance,
Daniel

Welcome to Discussions - try resetting your PRAM, if that doesn't work, I'm afraid there is something wrong with your logic board, where the firewire bus is located. The best thing to do would be to take it in for servicing.

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