Firewire port previously working now not recognized

Hello,
I understand this particular issue has been discussed at length on this forum and in other places but none of the solutions have yielded any success for me and I see this is often the case for others. So, I'm posting the question again in hopes that there is an Apple guru out there who has figured this one out. (All relevant specs below.)
Problem: Firewire port was working fine for downloading video from a Panasonic PV-GS320 into iMovie 8.0 on an iMac 10.5.8. Then, suddenly the firewire port was no longer recognized:
FireWire Bus:
Warning: Unable to list FireWire devices.
Maximum Speed: Up to 800 Mb/sec
The problem cannot be with the camera or cable as I can swap them over to an iBook 10.4 and the camera and firewire download perfectly there.
I have run AHT. Test results show no hardware problems.
I've tried all of these suggestions:
http://docs.info.apple.com/article.html?artnum=88338
http://macperformanceguide.com/blog/2011/20110808_0_Firewire800--howto.html
and quite a number of other solutions that involve rebooting SMC and PRAM but no dice.
I'm guessing this might be some kind of driver or software issue. There's got to be a simple solution to kick this thing in the butt and get it working again. I'd prefer not to do an OS re-install if I can avoid it.
Thanks much! Below are the specs:
iMac: 10.5.8
2.4 GHz Intel Core 2 Duo
4 GB 667 MHz DDR2 SDRAM
Firewire: 800 Mb/sec

Hi Tom,
I've had an opportunity to try all of the options listed on those links. I did omit one however, the Combo Update for 10.5.8. I hesitate to pursue this one b/c from what I can understand this 1GB's worth of update is basically a reinstall of the OS. I'd prefer not to take such a drastic action b/c I'm in the middle of editing a documentary and I don't want any other hardware or software to malfunction or alter behavior while I'm in mid-stream.
Let me know if I'm mistaken about this. As it stands the Combo Update is my last option, otherwise I'm just going to move forward with a dead port.
Just as a sidenote: the behavior of the firewire recognition has changed. Now, the system does not recognize the firewire plugged in at all. I used to get an error message, now nothing.
Thanks Tom and BDAqua.
If anyone else is reading this post I'd like to hear from someone who has experienced the same problem and found a/the solution.
Best Regards,
-J Mann

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Firewire port previously working now not recognized

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