Firewire Dead? how do you test it?

none of our firewire drives are mounting. occasionally in system profiler it says "unknown device" but more recently we get this:
"FireWire Bus:
Warning: Unable to list FireWire devices.
Maximum Speed: Up to 800 Mb/sec"
i ran both TTP and the hardware test from the original restore disks, TTP doesn't have a firewire test, and apple hardware test turned up no errors after multiple detailed checks.
is there a hardware test that can be done to test the firewire bus? or should TTP and apple hardware test find it?

Have you tried plugging in just one firewire device at a time? A lot of people have found that a single device can prevent the system from recognizing all the other firewire devices that are also connected. Unplug any USB devices (other than keyboard and mouse) too, in case a storage device is the problem.

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