hi, i have a similar fw51zf

but mine has alc262, subsystem id E00.

try some of these kexts in this thread.
http://www.insanelymac.com/forum/ind...howtopic=83633

i installed 262_200 and 262_f00 and they work.

i deleted
alcinject
, applehda,
and voodoohda kext,
i then copied the provided 2 files in the links of the thread in extensions folder,
then run kext utility
and then repair permissions from disk utility.