Mac G5 - Firewire 800 issue

Hi, I use a late G5, 2.0 GHz, 10.4.11. It have two firewire 400 and one 800 ports. I use my Mac for music production, so I have two external audio interfaces, Mackie Onyx 1640 and Presonus Firebox.
Presonus is connected via firewire 400 onto a Mackie firewire bus, then Mackie is connected via firewire 400 onto my Mac. Everything is fine.
I used a Western Digital (My Book Home) external hard disk. It had firewire 400 but I used a firewire 400 to 800 cable, so I connected it on firewire 800 port on my Mac. I hadn't any problem.
A week ago I replaced My Book Home with a Western Digital (My Book Studio) external hard disk. It have firewire 800 (and usb). When I connect it on firewire 800 port on my Mac, it conflict with my external audio interfaces. Both of them go out of synchronized and they need switch off and on again.
Western Digital (My Book Studio) is powered from a separate outlet from Mac. I tried connected via usb and everything is ok.
I connected a firewire 400 device on firewire 800 port on my Mac and everything is ok again. Only firewire 800 connection seems to have this issue.
Then I open my System Profiler. Under Firewire tab I noticed that appears an Unknown Device, Manufacturer: Unknown, Connection Speed: Up to 400 Mb/sec (except the two external audio interfaces and My Book Studio that appears right). I disconnected all of my firewire devices from my Mac, I restarted it again, but Unknown Device is still there at my System Profiler.
It seems to me like it is some kind of drivers but where?
I connected Western Digital (My Book Studio) on a friend's Mac G5 (with the same Mackie Onyx audio interface) via firewire 800 and everything works properly. Of cause at his Mac System Profiler there was not any Unknown Device...
Any suggestion please, any answer?
Thank you in advance.
Message was edited by: Spy x

Hi Tom, thank you for your reply. Although I had read these threads, today I tried many things from what these says but without success. Then I read to a thread here that the Unknown Device at my System Profiler exists to every Mac G5 dual or quad core at Firewire tab. So this query goes out but my problem exists.
But now I have some new data. I mentioned at my first post that when I have connect My Book Studio to a usb port I haven't any conflict with my firewire devices.
Today I noticed that when I have connect My Book Studio to firewire 800 port and the same time only one of my audio interfaces (Mackie Onyx 1640 or Presonus Firebox) connected to a firewire 400 port there is not any conflict. The conflict happens when I plug and the second audio interface to another firewire 400 port.
Summary, there is a conflict when I have connected to my Mac an external disk to firewire 800 port and two audio interfaces connected to firewire 400 ports (one for each). No conflict with the external disk to firewire 800 port and only one from the audio interfaces (one or the other) to a firewire 400 port.
An additional info: At Audio MIDI Setup I have configure Mackie Onyx 1640 and Presonus Firebox as an Aggregate Device...
Any suggestion please?
Thank you, Spyros.

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