Firewire bus and ethernet not working

The computer has stopped recognizing anything plugged into the Firewire ports and also does not recognize the ethernet cable. I've restarted, unplugged everything, reinstalled the system, reinstalled some specific software I need, reset the PRAM and done the <command>-<option>-<o>-<f> commands:
reset-nvram
set-defaults
reset-all
Nothing has worked and if I plug the same components into another machine, everything works fine, so it must be with this specific computer (not cables, other hardware, etc.).
At this point, I'm thinking it's a logic board issue, but this machine just had a new one put in in May. So before I take it in again, does anyone have any other ideas? This machine is used in a laboratory to take images from a microscope, so a quick fix to this problem would be preferable to a repair, if possible.
Thanks.
Message was edited by: JMug

Welcome to Discussions - it is probable the the replacement logic board has failed, the functions you mention are controlled by it, but try one of these solutions:
1. Downloading and installing the combo updater of the system software update they've just applied via "Software Update...".
2. Another trick is to restart each by zapping the parameter RAM:
Zapping the P-RAM:
After the startup tone, hold down <commandd><option><r> until 3 additional startup tones are heard, then release the 4 keys.
3. A 3rd tip would be to do Open Firmware resets on each:
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 (there are no space characters in each command):
reset-nvram
set-defaults
reset-all (the Mac will boot up after this command is entered)
If none of them works, a trip to the repair shop would be indicated.
Please post back with results,

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