Connecting Camcorder to Firewire disables Firewire bus

I have a strange problem:
My Canon MVX350i yet worked without any problems with my Intel iMac (Dec 2007).
Since I rebooted with the camcorder powered on and connected by firewire cable, I have huge problems.
Connecting the camcorder now disables somehow the firewire bus completely. E.g. firewire disks are disconnected just like unplugged while running and the camcorder will also not be recognized as video device.
What happened at this unfaithfull reboot?
I already deleted the preferences from my user account and I also reset the PRAM. Nothing helped.
The camcorder is still ok, because I can use it *without problems* on my *MacBook Pro*. Due to this fact, somethings *must not be ok now on the iMac*.
Interessting fact: Connecting my other video device, a Canon HV30, makes not problems.
Q: How can I make my MVX350i also working again?
Any hints are very welcome and will really be appreciated.
Kind regards,
Roland

I too have been experiencing a problem like this with my Canon XL2. When plug in the XL2 using a firewire 4pin-6pin cable into the Firewire 400 port, it disables my firewire 800 external HD (i.e. disconnects it as if i just pulled the cable out). However, i can still use them separately, but not at the same time. I am unable to load any video directly to my external devices. I was able to do this with my old Powerbook G4, but not with my new iMac. Also, the USB devices interfere with connecting my camcorder, as if the computer doesn't even recognize the XL2 until all other devices are removed.

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