nach Wochen die Lösung:
The Firewire ports on my Power Macintosh G4 suddenly stopped working. Why?
Your system most likely needs a logic board reset performed on it. Follow these steps:
1. Unplug your computer.
2. Push the power button on the front of the case 2 or 3 times.
3. Open the case and remove it's PRAM battery.
4. Leave the battery out for at least 10 minutes.
5. On your logic board there is a small reset button, usually a square metal block soldered to the logic board with either a brown or gray button inset into it. Press the button using a ball point pen and hold it for 5 seconds.
6. Replace the PRAM battery
7. Reassemble the system.
And, also resetting the NVRAM is a good idea – follow these steps to perform this task.
Start the computer while holding down the Option-Apple-O-F keys
The Open Firmware screen will appear.
Type in the following:
* reset-nvram
* set-defaults
* reset-all
Your machine will restart automatically.
If this did not fix the problem, your FireWire ports could be physically damaged and would require a logic board replacement.
