Need to adapt iMac iSight Firewire connector to USB for testing

My foundation recently recieved a donation of a number of early Intel iMacs (1.83's). I re-imaged them with 10.6.8, and they all work fine, except that the iSight camera in about 50% of them doesn't work. I checked, and they don't show up on the Profiler under usb. I pulled the front panel on one and it all seems normal. The iSight has a mini Firewire connector on it, (a bit strange for a USB device), so is there a way to spice a USB with a Firewire cord, so I can try plugging the camera into another computer to verify it's operation? 50% sounds a bit high for outright failure on these, especially since their use was prohibited at the school they came from. I am more apt to believe that this is a software issue of some kind, but i have tried all of the standard suggested "fixes" and nothing seems to help.

I think I would try a SMC Reset before pulling all those units apart.
As old as your iMacs are, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

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<Link Edited by Host>

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or you can get this cable http://store.apple.com/us/product/TP320LL/A?fnode=MTY1NDA3Ng&mco=MTA5MjUxNjk
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Need to adapt iMac iSight Firewire connector to USB for testing

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