FW 800 Card kills FW bus on G4

I tried to install an Allegro Firewire 800 card from Sonnet into my G4 1GHz Dual Processor G4. I put the card in, connected my firewire drive and got the following outcome.
1. When I re-booted, the computer hung at the blue screen that comes right after the gray screen. It stayed there for a very long time 5+ minutes but finally got through it.
2.When I logged on I found that the firewire ports on the Sonnet card AND also the native FW 400 ports no longer worked.
3.I removed the card, rebooted, and the machine still hung at the blue screen for a long time. It finally got through it, but the FW ports were still dead.
4. I worked for almost two hours, rebooting, trying to reset the PRAM, although I just got a black screen and no "restart" as is the usual case.
5. Finally, I unpluggd the machine completely and re-booted one last time and magically, the native FW ports started to work. So now I am back where I started.
Any ideas what is going on here? Should I try to install the card again? I am thinking that it was a mistake to hook the drive up before the machine had a chance to recognize the card, so I am tempted to try again that way, but I am afraid of getting the same results. Or should I just throw the card in the trash basket, call it a $50 loss or be content with FW 400?

See this thread for the answer to the problem
http://discussions.apple.com/thread.jspa?threadID=1866804&tstart=0

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