Anyone able to mount more than 3 firewire devices on their Alum 2.4 imac?

Hi.
I can't power up more than 3 firewire devices or my imac kicks everything off. I have 2 Lacie 1T drives piggybacked on the 800 port and then a powered firewire hub plugged into the 400 port. I can have either another firewire external HD OR an external Cd/Dvd recorder plugged into the hub. If I try both (or any combination of 2 firewire devices) - the imac kicks everything off firewire, both on the 800 port and the 400 port. All my devices have their own external power supply. It also doesn't matter how I chain the drives. I can have 3 on the 800 port but then nothing on the 800 port.
This is a bummer for me. I migrated from a Dual G5 2GB with 4 external HDs and an 2nd external DVD writer attached. My drives are 2 1Ts, a 800 GB and a 400 GB. I do a lot of photography and video editing so I really need the external space. I guess this imac really isn't a "Pro" model but I didn't need any more speed and I wanted to save space and money. And I love the 24" screen. I think Apple should say up-front if there are significant limits to the imac's Firewire capabilities.
Are any of you you able to attach 4 firewire devices at one time? If so, then I guess my machine is defective and I'll start working with Apple on exchanging it. Please let me know.
Thanks

I think you should be able to do much more than 4 - I believe the theoretical maximum is somewhere at 20+ devices (if they are self-powered). I don't have a 24inch but instead a 20 inch but I'm running three HDs and one DVD drive and in fact, all daisy-chained onto one single firewire port on the Mac. Do your external drives have two ports or just one? In the former case, you might want to try skipping the hub and just daisy-chaining them. I've never owned a firewire hub so I don;t know if they can be touchy but you might want to give it a shot.
Andrew

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