Yes it is!... G5 with the same problem...I try this 2 possible solution from
two different peoples...I never get it back...But, you can try...
I get a PCI DV1394.Good luck!!!

From:Sterett Prevost
Re: Stephen Curry and both FW ports
Perhaps one of these suggestions will help:
1) Pull ALL cables (pwr, USB, etc) and let sit for 10 minutes; reconnect & restart. f0 2) press the SMU reset button (ONCE) on the logic board; it is halfway between the lowest RAM slot and the bottom edge of the logic board.
f0 3) Zap the P-RAM:
f0 After the startup tone, hold down <cmd><opt><p><r> until 3 additional startup tones are heard, then release the 4 keys. Note: the <cmd> key is next to the space bar and may have an apple or "propeller" on it, while the <opt> key is next to it and may have the word "option" and/or "alt" on it.
f0 4) Open Firmware reset for PPC:
f0 After the startup tone, hold down <command><option><o><f> until the text screen is visible. When text can be entered, type the following commands, followed by the <return> key:
reset-nvram
f0 set-defaults
f0 reset-all (the Mac will boot up after this command is entered


From: Nordahl
I have revived FireWire ports with this Open Firmware action:
Boot into Open Firmware:
Restart holding command-option-of
At the Open Firmware command line key in:
reset-nvram <press return>
reset-all <press return>
Your MAChine should restart and your FireWire ports may be available.

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