No audio from EXTERNAL iSight on Intel iMac

Hi, i have a curious problem:
When my external iSight is plugged into my Intel iMac, i am not able to get any sound from it onto the computer. When checked in the audio settings, the "current level" indicators either dont move, or shoot right to the top then go down very slowly (this is most weird, but rarley happens). The internal mic works fine. But i want the noise cancelling directional mic of the iSight, as i want webcam / recording of things not directly infront of the computer.
Its not the iSight its self, becuuse ive plugged that into my PowerBook G4 12" and it works like a dream. Tested in the audo preferences and also using skpes voice test feature.
Both computers have the latest versions from software update of pretty much everything.
Im stumped. I really want to use the iSight, and clearly it can be used like this, but something is fishy!
Any ideas?

Ok,
so ive found my own solution, but it seems crazy!!
I plugged my iSight with firmware 1.0.2 back into my PowerBook 12" running 10.3.9, went to software update, selected the iSight firmware update, downlaoded, installed and ran it. iSight updated.
I plugged back into my Intel iMac, and hey presto!!! It now works like a gem.
What i dont get is why i cant run the firmware update program on 10.4.*, when it seems neccessary to install the firmware update. Is it a Universal Binary issue? Inwhich case why hasn't it been updated, and if not, then what?
After all, if i didnt have an older mac which allowed me to run the firmware installer / updater then what could i have done.
Anyway, i hope this helps some people.
Emma xx

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