Isight Access Causes iMac to Hang

Hi All,
Having completed two recent updates - Airport Extreme Update 2007-001 and Security Update 2007-001, I now find that my Imac 'hangs' every time an application tries to acces & use my iSight camera. Happens in iChat and Photobooth for example. Is also not user-specific (logged on as another user with same result). I have already tried rebooting (necessary to shutdown each time via the power button as no other mouse or keystrokes respond), and also downloaded these updates and re-installed them to no avail. Any ideas before I try an OSX re-install?? As far as I am aware iSight was working perfectly prior to these updates - regular use via iChat/Skype etc. I admit to recently having also reviewed and modified a few system preferences (not sure which ones or even if these would have had such a disastrous effect).
Oh for a 'system restore' button!! (sorry - ex PC user!!) Roll on Leopard!
No , seriously any help would be much appreciated.
OSX is 10.4.4
iChat is 3.1.6 (v441)

I would re-order this list
1) you can remove your system level cache file /Library/Caches
Use something like MacJanitor from this FAQ as it will clean them to the same Extent running the Cron Scripts do if the computer is On and Awake at the required times.
2) reset your PRAM -- http://docs.info.apple.com/article.html?artnum=2238
3) update your OS. Your notes say you are running 10.4.4. Current version is 10.4.8. The OS update from 10.4.7 to 10.4.8 is rather substantial and resolved several issues.
Combo Updates are here Make sure you pick the right one.
4) After installing ALL the Apple udpates I would use Disk Utility to repair your disk permissions.
5) f that fails then reset your PMU/SMC/SMU depending on what kind of computer you have.
MacBook and MacBook Pro version It links to others at the top of the article.
6) Only after careful consideration and asking more here
... an archive and install would be the next way to go -- http://docs.info.apple.com/article.html?artnum=107120
5:07 PM Monday; January 29, 2007

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Trying to use an external Apple isight with a imac G5 (without built in isight) running on Leopard OSX 10.5.8.
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Additional Details:
Also when I go into System profiler and look in FireWire it says unknown device.
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jonsonby wrote:
Really need help to figure this one out.
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Do you think it maybe broken?
I really hope not as it was sold as fully working
Welcome to Discussions, jonsonby
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Message was edited by: EZ Jim
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