Internal iSight no longer available - firmware problem?

Hi,
my iMac 17" Core2Duo (intel integrated graphics) is no longer able to recognize its built-in iSight.
Symptoms:
The iSight is no longer shown in System Profiler as "Built-in iSight" with manufacturer "Micron", product ID 0x8501 and vendor ID 0x05ac, but as having Vendor ID 0x04b4 und Device ID 0x8613.
According to various USB device listings, this corresponds to a "CY7C68013 EZ-USB FX2 USB 2.0 Development Kit".
This, again, is a generic USB controller, which obtains its final USB vendor und device ID by writing firmware into the controller's EEPROM - obviously the base for the iSight USB controller. This firmware information seems to be lost now (the iSight worked as of last week).
I already tried unsuccessfully:
- PRAM reset
- SMC reset
- iSight driver upgrade from Bootcamp 1.1.1
So, essentially, what would be required is a tool to reprogram the firmware (such tools exist on Windows XP and Linux) and the iSight firmware image itself. I also downloaded the Firmware Restoration CD (V1.1), but this CD doesn't seem to support the Core2Duo-based iMacs yet.
Any ideas? I'd hate to send the iMac back to Apple for repair if a simple software solution could fix the problem.
iMac 17" Core2Duo Mac OS X (10.4.7)

Just a short blurb to inform you that I managed to restore the iSight's firmware. It's quite a bit complicated, my current solution involves using Linux and a modified version of the firmware download tool for the iSight Linux driver. I'm not sure if anyone else has had this problem so far. So, if you're interested in the precise steps involved, drop me a mail (or, if you happen to speak German, see http://www.macuser.de/forum/showthread.php?t=203758).
Michael
iMac 17" Core2Duo Mac OS X (10.4.7)

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... the microphone vanished from the
list of audio sources available in the Audio
Preferences, or iChat, or anywhere
else.Does that really mean that
when iSight is plugged in it is not an available
choice in the System Preferences... > Sound >
Input device list?
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If so you may have a faulty Firewire cable.
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* The video and audio travels over the same data lines in the Firewire cable, and the video works fine. Cable problems would affect both audio and video.
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I sometimes get the feeling that the Mac is trying to hide important details about problems from me, and treating me like a baby. I mean, I have and know how to use a kernel debugger (though not yet on the Mac), oscilloscopes, and logic analyzers; I should be able to get the information I need to diagnose problems, rather than trying shotgun solutions.
If you haven't kept your Mac OS X maintenance up to
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I have repaired permissions; I will try a disk repair although I have no reason to believe that there are any file system problems (again, there are no debug messages in the logs that would indicate something like that).
Consider applying the 10.4.5 Combo Updater using the
method in How I Update My Mac OS X.
I'll try this too.
If you do not get help here or in Mac mini
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My nearest Apple Service Tech is over 50 miles away.
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