On Aug 21, 2011, at 5:20 PM, Deiniol ap Deiniol wrote:
...story continues...
Well I tried resetting PRAM, and no difference.
(I can't find the reset button on my motherboard to do the PMU: I
have the take-apart guide stored on another Mac so I'll look at that
later).
I've also done open firmware reset........(does this reset the PMU?)
........and I STILL have no firewire 400. My FW 400/800 card is
recognised, and system Profiler just shows the two FW800 busses - the
internal one and the one on the card.
I'm still unclear as to why the FW400 part of the card is not coming
on stream. After all OSX knows about firewire, so it should just find
the card, and it certainly finds the FW800 bits without any fuss.
My Griffin PowerWave powers uo from the FW400 port on the
card, and, if connected to the FW800 bus via adapter cable, is
recognized.
I've had similar issues before, with both software and hardware
causes. Hardware is always someone tried to insert a FW400 plug upside-
down, and since FW400 carries power it shorts out the port permanently
and it's dead forever.
The software issue is stranger, and I'm not sure of the cause? If you
boot in verbose, the Firewire bus is initialized as one of the very
first items. It needs to say "S400" for speed rather than "S100". If
is says "S100" it won't recognize any FW400 devices. I believe a Safe
Boot by holding the Shift key might rebuild System cache files that
could possibly be responsible for this issue? Otherwise you might try
reinstalling the latest Combo Update and see if that fixes it?
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