Audio problems with external iSight

Hi guys,
I have been racking my brain with a problem that I have (I think) narrowed down to my external iSight.
It initially showed up in Skype, but have confirmed in iChat also.
The problem is no audio. I do have video in both apps.
I have:
1. deleted the com.apple.audio.devicesettings.plist
2. reinstalled OS via Combo update
3. unpluged firwire multiple times - plus restart
4. repaired permissions - multiple times
5. Checked that iSight is recognized in System profiler>FireWire
6. deleted Skype and reinstalled an earlier version (2.7.0.330)
7. other things that are a blur now!!!
One key may be that every time I restart, my sound preferences>input is alway reset to lowest (off) position - even though I reset each time - even after deleting the .plist file above.
This outfit has been set upon this machine for years and never a problem until now.
Whew...
Any ideas?

John Dotson wrote:
Jim,
Tried both. Neither worked.
Tomorrow I will try an even older audio pref file.
I do not have another firewire device to trade out to check the connection, but since I have video, and confirmation in System Profiler, I am supposing it is good.
That sound input is still "resticking" at 0 at every restart.
Any other suggestions gentlemen? or Ladies...
Thanks for the thought process.
John
You're welcome, John.
Here are three more:
(1) Use Disk Utility to repair permissions. Then download and apply the 10.5.8 COMBO update:
http://support.apple.com/downloads/MacOS_X_10_5_8_ComboUpdate
Repair permissions IMMEDIATELY again after the restart that finishes the installation.
Then test again to see if it helps the problem.
(2) If properly applying the Combo Update does not resolve your problem, you may have problems within the basic system software.
Reinstall OS X 10.5 (Leopard). If you need help, see the instructions in the user manual that came with your Mac if it originally shipped with Leopard. If you Mac came with an earlier version of Mac OS X, follow the instructions that came with your Leopard Upgrade DVD.
After reinstalling 10.5.x, you can update to the latest version (10.5.8) Leopard in one update step by using the process in (1) above. Then check again for proper function of your system settings.
(3) If none of the suggestions you get resolve your problem and you do not want to continue reconfiguring your settings each time you restart, contact Apple or an Apple-Authorized Service Provider for service.
EZ Jim
Mac Pro Quad Core (Early 2009) 2.93Ghz w/Mac OS X (10.6.2) MacBook Pro (13 inch, Mid 2009) 2.26GHz (10.6.2)
LED Cinema Display G4 PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight

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