No audio device after restore

External iSight used to work fine on mac pro. Main drive died, restored from time machine and now it doesn't show up as an audio input device (in system prefs audio or iChat). Video works fine, and it shows up in system profile without issue.
Have created another user account, Reset PRAM multiple times, tried every firewire port, no luck.
Tried it on my Mini and audio shows there so it's not the iSight itself, it's something to do with the restore of the OS (was working fine prior).
I suspect there's a settings file in the system library that needs to be deleted but don't know what or where specifically to look.
I will be restoring again once I get the main drive RMA'd so really need to find a core solution.

@ Jim,
If in your Pic from earlier about the Unknown Device you clicked on the iSight the Firmware version should appear in the info at the bottom pane.
It needs to be version 1.0.3 (it never got higher than that)
@ Both of you
Also check MIDI Audio Set up (In Applications/Utilities when the camera is plugged in.)
There should be a drop down to select the different Imput devices that there are.
The External iSight samples at the 48000 rate (most other USB Mics and the Internal Mics if you have one are sampled at 41000)
Try changing the sample rate in MIDI Audio Set up and see if it makes any difference.
Also in Hard Drive/System/Library/Extensions do you have Apple_iSight.kext (This is what you should be looking for)
In Cover Flow view it will appear as the top Apple item due to the underscore.
Mine is there. (I expected it to be as I have never done a Fresh Install of Snow Leopard)
However it is showing a Modified Date (I choose to show that column) that is within the life time of Snow Leopard. (And matches the date on many other items)
7:40 PM Friday; June 17, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb( 10.6.7)
 Mac OS X (10.6.7),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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