Problems reading my external firewire devices

It seems my 400 firewire port on my PB is fried or shorted. i cant read any device through it. my 800 port is fine, reads my 800 external drive fine, but when i try to route a 400 device either a drive or a camera through the 800 device and through the 800 port, the 800 drive ejects/removes itself from the system automatically...
any ideas on what to do or wh6y this happens?
rerally need a solution, hopefull not replacing the logic board would be good
thanks
eric

It may be you need to reset the 'FireWire' port.
1) Turn off your PB remove battery, go and make a nice cup of tea. Replace battery after about 20 mins or so and start it up, does it work now? No then try:
2) Reset PRAM and here are the instructions:
http://docs.info.apple.com/article.html?artnum=2238
Does it work? No then try:
3) Reset PMU here are the instructions:
http://docs.info.apple.com/article.html?artnum=14449#faq10
I have now run out of suggestions sadly so it may be time to contact Apple.
Hope you get it working!
Phil

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