ISight picture scrambled on Power Mac but works perfectly on iMac

Hi all,
This is my first post here so bare with me.
My iSight has been working perfectly on my Power Mac G5 over the last few months, but I haven't really used it recently. Last night I decided to fire it up to record something but the picture was scrambled (see the link below). I tried rebooting my computer, and removing the iSight and plugging it in (in the same and different firewire ports), I even went as far as creating a new user account but the problem remains.
I also have an iMac G5 (Rev A) here so I chucked the iSight on that and it works perfectly. I've searched these forums, google, and posted on another Mac forum I frequent but I can't find any information on what I need to do to reinstall the "driver" if that is the correct work on a Mac for the iSight. I am pretty sure the iSight was working fine on the Power Mac under 10.4.3, but both Macs are running 10.4.4 so I'm pretty confused as to why it would work on 1 and not on the other.
Can someone please point me at the file I need to edit, remove, reinstall? If it is something else I'm all ears.
Thanks heaps!
link to screenshot of iSight fault: http://img12.imageshack.us/img12/1573/powermac0ix.jpg
Power Mac G5 Dual 1.8 (Rev B)   Mac OS X (10.4.4)  

 Hello, risc. Well done first post! Based on your good info, here are my suggestions.
The fact that you know your (non-iMac) G5 was working with iSight prior to 10.4.4 update makes me suspicious of that update. Give the 10.4.4 Combo Updater a try using the technique suggested in How I Update My Mac OS X. If that does not correct your problem, consider any of the following that apply to your (non-iMac) G5 system.
You can test your iSight on your (non-iMac) G5 by using the suggestions in How to test your iSight to ensure it is functional. Although you KNOW your iSight works, these tests might help you identify the cause of your symptoms.
I understand that your iSight works on your iMac, but perhaps you have other issues that are creating problems on the (non-iMac) G5. In addition to the possibility of Mac OS or Firewire problems or hardware or software conflicts, your (non-iMac) G5 might need Mac OS X maintenance.
You do not specify which app you were using to drive your iSight, but the QuickTime suggestions from Help for iChat AV 3 Problems may help even if you are using apps other than iChat AV.

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