External iSight microphone not working with Mac Pro

i have researched this extensively to no avail.
i have an external iSight camera plugged into a pci express firewire port (i got one hoping to solve the problem). the camera works fine except for the mic. it shows up in audio inputs in system preferences but will not produce sound.
i have troubleshot it by plugging it into a Powerbook G4 and the mic worked perfectly. i have also tried different firewire cables and plugged the iSight into the firewire ports on the machine.
does anyone know if there are know bugs with leopard and external iSight...seems so weird that it would work on a G4 and not my Mac Pro.
any insight or help would be greatly appreciated!

Welcome to  Discussions, bigboi78
I do not have an iNtel Mac, but external iSight, including its mic, work fine on my 10.5.6 G5 DP tower.
As I understand, you have checked System Preferences, found external iSight as a Sound > Input device, and selected iSight's Mic. However, adjusting the "Input volume:" slider there while you make some sounds does not effect the fact that the "Input level:" digital VU meter there never flickers regardless of input volume setting.
I also understand that you used the same Firewire cable with your external iSight on both Macs, so we can eliminate a possible cable problem.
If my understanding is correct, I can think of two possibilities that may give you a fix before you seek help from an Apple Authorized Service Provider (AASP.)
(1) Be sure to test with ALL other Firewire devices disconnected to avoid Possible Hardware or Software Conflicts with iSight. If you have any untested third party iSight or AV software, you might even consider whether that could be causing a conflict.
(2) Applying the latest Combo Updater often solves strange problems. Do it this way:
• Download http://support.apple.com/downloads/MacOS_X_10_5_6_ComboUpdate
but do not install it yet.
• Disconnect all Firewire devices (if not already done) and restart your Mac
• Repair permissions
• Apply the 10.5.6 Combo Updater
• Immediately after the restart that finishes the update, repair permissions again
• Reconnect iSight (only) to test whether the problem is solved
• If so, reconnect your other Firewire devices (if any) one at a time and test again
• If the problem returns when you have multiple FW devices connected,
you need to keep the others disconnected while using iSight's mic.
(3) My only remaining suggestion is to seek help from an AASP.
We will watch for your status update.
EZ Jim
G5 DP 1.8GHz w/Mac OS X (10.5.6) PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight

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