Imac i5 late 2009 running OS X 10.8.4 and can't get FireWire connection to work

I have Imac i5 late 2009 running OS X 10.8.4 and can't get FireWire connection to work with LaCie external drive. I have gone through older posts and tried with no luck power cable and holding down start button for 15 seconds and restoring power and also removing power cable waitng 10 minutes replugging power cable holding down alt command P, R keys until second beep is heard. I know that LaCie drive and cable are working, they were connnected to another iMac without issues. What options do I have left to get FireWire to work? The System Report just says
FireWire Bus:
Maximum Speed: Up to 800 Mb/sec.
Thanks for any help
CS

I did not mention in original post that when initially connected to the Firewire port the LaCie drive I can hear activity so the drive is getting power. Does this mean the Firewire port may not be physically damamged and there may be options for resetting? Are there any 3rd party software repair programs worth buying for diagnostics and repair of the FireWire port?

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