Boot into openfirmware and do a "listdev" (if the intel ones still have OF)
OPT+CMD+O+F
Listdev (I think) should show what devices are seen by it.
do it with the FW400 port in use, and unused, see what happens.

On Tue, Jan 5, 2010 at 7:46 PM, Elliott Price <[email protected]> wrote:
> You might also try zapping the PRAM, hold Opt+Command+R+P on startup, and 
> wait for three chimes. This resets the hardware settings, so maybe that'll 
> help. (If Clark's suggestion doesn't work)
>
>
>        -Elliott Price
> Mac Computer Repair - Santa Barbara
> Graphic Design - Artwork Setup
> Websites - Low Cost Custom Websites
>
>>
>> When you say power down and up again I take it you mean you shutdown the 
>> computer.  Try shutting it down then pull the AC power cord for about 30 
>> seconds.  I've seen problems like this fixed by TOTALLY powering down like 
>> this.
>>
>
>
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