External iSight no longer recognized, built-in iSight works - how to fix?

I have a new MacBook Pro with Leopard and both the built-in iSight and my external iSight were recognized and I could switch between them. This past week or so my external iSight became no longer recognized even after unplugging and re-plugging in. When I plug it into the Firewire port, the green light goes on and it makes a whirring sound, but my computer does not recognize it in iChat, in PhotoBooth, nor in iMovie. I repaired permissions and it still doesn't get recognized in any applications. Is there a setting someplace that needs resetting? Or do I need to bring it into the Apple store for technical help?
Richard

Hello Richard
I wonder how many others have this problem?
A search or look through iSight Discussions will show you that a few of the many users of external iSight have reported problems using their Firewire iSights with MacBook Pro. I will leave it to you to try to determine whether that might be because few external iSight users have problems, few have MacBook Pros, or few use their external iSights with their MacBook Pros.
I agree that the system should allow both to co-exist.
Any other suggestions before I go to the Apple Genius folks?
If you have already considered all the suggestions about cables, connections, Firewire ports, possible conflicts, and the relevant suggestions in Apple's How to Troubleshoot iSight without success, you can also try the following:
• Backup your Home Folder, or at very least, your important files.
• Repair permissions. (Click here if you need help.)
• Then download and apply the Mac OS X 10.5.2 Combo Update.
• Finish with another Permissions Repair, and then check your iSight again.
Users have reported fixes to a variety of audio, video, connectivity, and software conflicts and unreliability issues after properly applying Combo Updates.
Please let us know how it goes.
EZ Jim
PowerBook 1.67 GHz w/Mac OS X (10.4.11) G5 DP 1.8 w/Mac OS X (10.5.2)  External iSight.

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