ISight prevents Firewire external drive from working!

I just bought a brand new La Cie 320GB Triple Interface hard disk and have been using it through firewire on both my iMac G5 and my iBook G4.
The thing works perfectly with the iBook: fast and reliable. However, with the iMac G5, the Finder occasionally gives up transferring files saying that it had an "error -36" and that some files could not be read or written.
I noticed that the speed of the transfer usually slowed to a crawl (from 20MB/s to 2MB/s) before the error. And that I could repeat the error with the same files.
Worried for the condition of the new drive (or of the iMac's own HD) I searched in these forums for a solution. Following some written advice, I have zapped the PRAM, reset the Open Firmware and the SMU.
For a second it seemed that problem had been solved. But now it started again. Thinking that it could be a power issue I disconnected my iSight camera from the other firewire port. Lo and behold: the drive started working perfectly. All trasnfers completed without a hitch and with improved speed.
The question is: apart from what I have already done, is there anything that I could do to solve this iSight conflict? Or should I just cross my fingers and play it safe so that the whole power supply in my iMac G5 does not fail completely!?
Thanks for reading! Please help...
iMac G5 1.8 Ghz 1GB RAM Mac OS X (10.4.8) iSight
iMac G5 1.8 Ghz 1GB RAM Mac OS X (10.4.8)

External hard drive spontaneously unmounted? Try these tips:
NEW FIRMWARE: Try updating your external hard drive's firmware, which is available from your drive manufacturers Web site--or just use VersionTracker's (www.versiontracker.com) search function to find it. Be sure to back up your data before applying the update, and carefully follow the manufacturers instructions.
OUT OF iSIGHT: If you're using an iSight camera while you're using a FireWire drive, the camera may be interfering with the drive's ability to stay mounted. Try temporarily disconnecting your iSight and moving it to a separate FireWire port. If you have multiple FireWire devices, try using a FireWire hub.
POWER PROBLEM: A faulty power adapter could be causing your drive to unmount. Your drive may not be getting enough juice to stay on, causing the drive to turn off and thereby unmounting it from your Mac. Alternately, the power adapter may not be providing a steady amount of power, causing your drive to turn on and off. Try replacing the adapter. If you can't get a replacement adapter from the hard drive manufacturer, try your local electronics store. Just make sure the adapter you choose has the same connector and input/output voltage. you can find the input/output voltage on the adapter itself.
Cheers!
DALE

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