No video or sound from iSight

I have a frustrating problem ! My external iSight camera has stopped working, ever since I moved from a PPC G5 to an Intel Mac Mini. I did actually have it working for a while, but I must have changed something and now nothing I do will get it to work again.
I have tried isolating the problem by removing other Firewire devices - the camera is always correctly recognised no matter where I plug it in; System Profiler shows it as present, and it is shown as available as a video or sound source. The problem is that when I actually try to use it, I just get blank (black) and no sound input.
If I plug the camera into another machine, it is recognised and works OK !
I'm sure this must be a software conflict, but I don't know what with. Console logs just show similar messages from any application that tries to use the camera, saying that it's unable to open the source for input. I'm suspecting that some 3rd party plugin or driver is being loaded and crashing out - perhaps because I migrated over from a non-Intel machine (I did a clean install, and ran the migration assistant).
Any suggestions how to find the culprit ?
Powermac G5 Dual 1.8 Mac OS X (10.4.2)

Phew - got it working, but don't ask me how !!
I did a fresh install onto the internal HD (I already boot from an external one, see below). No dice. So I unplugged everything, and plugged in just the iSight.
I have a LaCie external HD which also works as a Firewire and USB hub. With this unplugged, the camera worked on the fresh install. I then re-plugged in the firewire leads for the hub, and connected the camera to the hub. Rebooted (****, OS X boots fast on a fresh install on the Intel machines !). Still working. Then I plugged in the USB leads for the hub, still working. Which is strange, because that's exactly the configuration in which is WASN'T working a few moments before ! I then rebooted into my original system (on the external FW disk), and it's STILL working.
Now this is really strange, because this is the config in which it really wasn't working before. All I can figure is that somehow connecting via Firewire first, rebooting, and then USB somehow tells the hub to work correctly as a FW hub. But this doesn't make too much sense, because other external HDs I have still worked fine before - it was only the iSight that wasn't working.
The only other thing I can think of is that in the process of doing this, I moved a small plastic photo frame that I have that was sat ontop of the mini. The thing with this frame is that it's 2 bits of perspex held together by magnets. They are only small, but I wonder if there was some interference caused by the tiny magnets that somehow effected the Firewire connection (but only for the iSight ?). Anyway, that's staying off the top of the mini for now !
I'm not sure if this explanation will ever help anyone else, but it does give you an idea how to isolate a problem. What I did was isolate the OS (by doing a fresh install), isolate the hardware (by unplugging it all, and selectively re-plugging it), and isolate apparently unrelated external influences (by removing the picture frame). If you're having strange problems with your computer, be methodical, and you will probably isolate the cause and fix it !
Mac Mini Mac OS X (10.4.8)

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