Firewire 400 issue with new iMac 20"

Hi all,
Maybe one of you can help. I've got a problem with my Western Digital myBook 500Gb external harddrive when I connect it to my (new) iMac 20" using the firewire 400 port. The drive does not show up on the desktop, not in diskutility and also not in the systemprofile (it just says 'FireWire-bus: Maximum speed: maximum 800Mb/sec').
To make sure there's nothing wrong with the port I connected a Canon DV camcorder (using the 400 port but using different firewire cable). I shows up correctly in the systemprofile and I can get data of that. So, I assume the port is functioning properly.
To make sure the external drive is working and there's nothing wrong with the firewire cable, i connected the drive to my 'old' iMac (a core duo 17") and it all works fine. So, the device must be ok and the cable aswell.
Some extra details:
- Both macs run osx 10.4.10.
- If I connect the drive using usb, it all functions correctly, i can even boot from the drive.
- When I booted the 20" mac for the first time i used the wizard to copy over the data from the old mac using the firewire cable. That all worked correctly.
Any ideas what could be wrong?
Any help would be very much appreciated.

Some more details: if i unplug the power from the drive and refresh the systemprofile it does find the drive, although it is listed as an unknown device:
Unknown device:
Manufacturer: Unknown
Model: Unknown device
GUID: 0x0
Maximum speed: Maximum 400 Mb/sec
Connectionspeed: Maximum 400 Mb/sec
(the above was translated from Dutch).
If I then plug in the power of the drive, sysprofile says 'FireWire-bus: Maximum speed: maximum 800Mb/sec' (also translated from Dutch).
Oh and zapping the PRAM did not make a difference, nor did removing WD files from the Library -> StartupItems folder. The LaunchDeamons folder was empty.
Message was edited by: Luca5

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