The Firewire 400 port on my Powerbook G4 1.67 is dead. It seems to have power on it but will not see anything plugged into it. I also cannot see it in the system profiler. This happened (I believe) because of a particular piece of equipment that was plugged into it because a similar thing happened to my desktop G4 when the same equipment was plugged in! I have worked around the problem by purchasing a cardbus adapter but this is not ideal as it doesn't provide power to drives. I have tried all the usual recommendations of resetting the power management etc but wondered if anyone has any other suggestions to wake the port up or should I just accept it is dead forever?