IMac FW 800 Port Problem & One Solution

I recently had a problem with my 2010 iMac's FW 800 port. I searched these discussions and found a solution that worked for me. I want to pass on the tip. I knew there was a problem with the port because I could access my FW 800 drive using the same cable when attached to another Mac.
This was confirmed when I displayed the "More info..." window from "About This Mac". I am running Mac OS X 10.7.1 Lion and the "More info..." button starts up a System Information app. Click on "System Report". Choose "Firewire" in the Hardware section. If your FW 800 port is not recognized there's be a message in red (I forget the exact wording).
Following directions in this message by den.thred, I reset the SMC > http://support.apple.com/kb/HT3964
That worked for me and I hope it works for others. Thank you, Dennis!
Charles

How curious, in Sytem Profiler or System Informatio>Firewire, what does it report like this...
Maximum Speed:          Up to 800 Mb/sec
OEM ATA Device 00:
  Manufacturer:          NewerTech
  Model:          0x0
  GUID:          0x30E002E0002156
  Maximum Speed:          Up to 800 Mb/sec
  Connection Speed:          Up to 400 Mb/sec
  Sub-units:
OEM ATA Device 00 Unit:
  Unit Software Version:          0x10483
  Unit Spec ID:          0x609E
  Firmware Revision:          0x110
  Product Revision Level:
  Sub-units:

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