Is there a way to test the Firewire 800 port?

My firewire 800 port seems to no longer work on my Imac. Before bringing the machine to repair, I was wondering if there is any way to test the port, or to reset it. I remember I had a similar issue a few years ago and I could make it work again.
Thank you for your help!

Hi Felix
1. Try resetting the FireWire bus as described in the +What to do if your computer won't recognize a FireWire or USB device+ article below:
http://support.apple.com/kb/HT1317?viewlocale=en_US
2. Connect a FireWire device and open your *System Profiler,* then in the Hardware section select FireWire to see if the device is shown on the bus.
Dennis

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http://support.apple.com/kb/HT1317?viewlocale=en_US
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Is there a way to test the Firewire 800 port?

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