Can't use microphone to audio chat. Can hear others, no input opt for me.

Quicksilver Dual 1GHz G4
1.5GB RAM
OS 10.4.10
iChat AV 3.1.8
I am unable to audio chat. If others initiate an audio chat with me I can hear them fine. This is not a bandwidth, router, or ISP related issue.
I have professional microphones connected to computer via MOTU 828 mkII FireWire interface. Latest hardware drivers are installed, and the MOTU input/output audio interface is working fine. All sound output is via the MOTU and functioning normally. Microphone levels present in System Preferences / Sound and in Garage Band.
However, iChat AV prefs show no Sound Input options. I am unable to initiate an audio chat.
I have done normal troubleshooting steps such as reinstalling MOTU drivers, restarting all hardware, trashing com.apple.iChat.plist, etc.
I would appreciate any comments or suggestions in helping troubleshooting this. Thanks.

The problem is 10.4.10 which broke the USB audio input. So far I think it affects all divices, in my case it is the internal microphone of my Logitech Pro 5000 camera.
This is the easy and secure workaround without downgrading the whole OS to 10.4.9. You only use the AppleUSB Audio.kext out of the 10.4.9 version. I just did it within 10 min. without any problems and the microphone now works fine! The OS version is still 10.4.10.
1) Download "Pacifist"
http://www.charlessoft.com/
2) Download ComboInstaller 10.4.9. (300 MB)
http://www.apple.com/support/downloads/macosx1049comboupdateintel.html
3) Delete the "old" AppleUSBAudio.kext in Macintosh HD->System->Library->Extensions with admin key.
4) Using Pacifist, open the ComboInstaller 10.4.9 (for Intel), extract (not install!) the whole .dmg and search for AppleUSBAudio.kext in the 10.4.9 installer (System->Library->Extensions)
5) Press "Install"
6) Restart

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