Problems to connect two external firewire hardrives at the same time

I try to have both external connected at the same time one via Firewire 800 and the other via Firewire 400 and it doesn't work. My solution is to change to Usb 2.0 one of them. Maybe I have a problem with my Firewire? How can I check if the ports are working properly?
Thank you in advance for any help!
The two external hardrive: one Lacie 1TB Big Disk Triple Interface and a Lacie d2 Extreme Triple Interface.
iMac 24" 2,33Ghz Intel Core 2 Duo   Mac OS X (10.4.8)   2Gb RAM, 500 Gb Hardisk, Nvidia Gforce 7600 GT
iMac 24" 2,33Ghz Intel Core 2 Duo     2Gb RAM, 500 Gb Hardisk, Nvidia Gforce 7600 GT
iMac 24" 2,33Ghz Intel Core 2 Duo     2Gb RAM, 500 Gb Hardisk, Nvidia Gforce 7600 GT
iMac 24" 2,33Ghz Intel Core 2 Duo     2Gb RAM, 500 Gb Hardisk, Nvidia Gforce 7600 GT

I'm having a similar problem. New iMac 24" with one FW 400 and one FW 800. I have a Seagate in an external case connected to the FW 400 and I got a new LaCie D2 triple interface and am trying to connect via the FW 800. Both drives have their own power supplies. When I connect the LaCie to the 800 port, it mounts and works fine. But as soon as I connect the Seagate to the 400 port, the LaCie icon disappears and I get a message about improper removal of a device. So, both drives work fine when connected one at a time, but don't play nicely together. I will appreciate any suggestions.
iMac   Mac OS X (10.3.7)  

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