Firewire Bus Issue

I have a I Mac G5 with 10.3.9 installed and I have had the computer for about 1 and a half years. I have daisy chained three maxtor drives which I okayed with apple support--I wanted to make sure this computer could handle the three drives, and a video converter. About two months I bought the LaCie dvd burner and have to swap firewire ports with the Sony Converter when I want to burn discs.
Everything has worked just fine until about two weeks ago when i couldn't boot up the computer. I took it into an Apple Store thinking it might be related to a power problem I had about 9 months ago. After a two hour diagonostic was run twice on the machine the support people could find nothing wrong with the computer.
It also started up fine without the firewire ports being used and I didn't recognize that this must be the problem at that time.
The next morning, with the firewire cables plugged in directly to the back of the computer it wouldn't start, so I shut down, unplugged everything, waited a few moments and then plugged the processor back in. It started right up.
Now, I understand what's wrong, but don't know how to fix it. When the unit doesn't start up, as it didn't a few nights ago after I burned a dvd, I shut down and unplug the firewire cable and then reboot. I then can plug in the Maxtor drives, etc., and the processor works fine.
So, it seems to be a start up issue with the fire wire bus or whatever.
Does anyone know what I can do to fix this and get things back to the way they used to be?
I don't want to upgrade to Tiger because I have apps that won't work with Tiger and I don't want to upgrade them at present either.
Any help or advice would be greatly appreciated.
By the way, I use the external drives for my film shorts.
Lucin

This is Apple's article -
http://docs.info.apple.com/article.html?artnum=88338
FireWire ports can (or use to) get "fried" (99% of
the first FW Mac, Blue G3 users had to eventually
invest in PCI FW controller as ports would just stop
working).
I would invest in PCI FW800/400 rather than
daisy-chain and so you have two buses (all the FW
ports share one common bus).
A powered hub has its own a/c.
There use to be more talk about using "isolator FW
cables" to prevent hot-plugging from causing
electrical damage to FW ports.
I am not a fan of most of the vendor supplied FW
cases (Maxtor, WD, etc) and just go with a good
Oxford based unit (FW bridge type) which are more mac
friendly and work. Or even eSATA for hard drives
(SeriTek etc) which allows each drive to be on its
own channel.
Hi,
Thanks for the imput. What do you mean that the powered hub has it's own a/c? I'm confused.
Next time I get a drive I may go with the Oxford based, altho' I have to say that the Maxtor Drives have been very reliable so far.
As for the controller, I have to see if I can get one for the IMac. I got a PCI card for my G4 and that was a help.
I'll check out this article. Actually, I've already read this.
When I took the machine to the apple store they checked my firewire ports. They checked everything and they said when I called today that the ports were not fried, that they were okay.
My question is: why would the computer boot up when I unplug the fire wire cable and not boot up when I don't? this is a new development and I've been fine with this machine for over a year.

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