Computer shuts down when connect FW 400 device

I have a PowerMac G4 dual 1,25 FW800, 1Gb ram and OS 10.4.3.
When I connect a Mcally Firewire 400 hub the computer shuts down immediately.
It does the same thing when I connect a Delkin FW Compact Flash card reader.
I tried different cables on both FW ports.
The devices work well on Powerbook.
Also, I succesfully connect a printer and a LaCie HD to the FW ports of the PowerMac.
Can anyone suggest what the problem might be?
Thank you,
Francesco Tonell

Thanks Ryan
Attached to the PowerMac I have 2 LaCie 500Gb FW800 each with thier power supply + 1 LaCie Mobile 80Gb FW400 without any power supply + and Espon R2400 FW400.
If I conncet my FW400 card reader with any of the two FW400 ports the PowerMac shuts down immediately.
But I found a small workaround. If I connect the FW400 card reader to my LaCie 80Gb and then the LaCie 80Gb to the PowerMac it works fine.
Francesco

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