Issue Using both Firewire Ports on 24" iMac

I just got a new 24" iMac with the 3.06 processor. I intend to use it with Pro Tools and other music making software. I have an audio interface that is firewire only and an external hard drive (where I store my audio files) that is both firewire and USB. The problem is that I when I use both firewire ports (800 and 400) at the same time, my Pro Tools starts acting up. And I found one post stating that this was a known issue with the 24". But that was back in May and I thought it would have been resolved by now. Anyway, when I use the USB port on my hard drive instead of the firewire, everything works. Also, on my 17" iMac PPC G5 everything works just fine on there, including using both firewire ports a the same time. Finally, I've got the latest updates on all devices involved. Has anyone experienced this problem or have any knowledge of it? Thanks in advance.

I've got a similar problem. I've got a WD external drive connected via FW800 and an Mbox pro 2 audio interface connected via FW400 to my 24" mid 2007 iMac. They both power on (the mbox gets it's power from the iMac) and are recognised by the iMac. However, the WD drive seems to take dominance at some point during start up. The reason I know this is because I was watching the LED on the Mbox light up as I sent it signal from the guitar and then it suddenly stopped lighting up. I tried daisy chaining the mbox to the WD but outcome was the same. Then tried chaining the WD drive to the Mbox (this meant the WD drive was now down to FW400 speed). It worked!!!.............until the next time I started up the computer. The WD drive wasn't recognised by the iMac.
I'm not impressed with the iMac's inability to deal with devices from both it's ports. Why put them on the machine if they can't handle it?
I bought the WD drive to work at FW800 speed and don't want to have to submit to USB 2.0 if I can help it.
Any suggestions welcome.
Thanks

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