Firewire has stopped working - help!

I have 11 iMacs in an education suite. All are the same model and age and have the same set of software on them. Two of these machines are having problems with the firewire ports in that they won't recognise any connected devices including DV video cameras, audio interfaces, external HD's or indeed other iMacs (when started up with cmd T).
All machines ate 20 inch screen dual 1.8 intel core duo machines with 4 GB RAM
Does anyone know what might be causing this or how to rectify the problem
thanks

FireWire ports are prone to failure if the user is constantly plugging and unplugging devices on-the-fly. I had a FireWire port fail on me, but fortunately, it got fixed under AppleCare. This issue is documented on various web pages (you can use Google on "firewire port failure"), including this one.
http://www.wiebetech.com/whitepapers/FireWirePortFailures.php
One thing you can try, if you have not already, is to reset the SMC (power management)
http://support.apple.com/kb/HT1543
I use a self-powered FireWire hub for devices I connect and disconnect often and on-the-fly, such as an iPod or video camera. I might still blow a port, but it will be on the $30 hub and not my Mac. I use the Mac's other direct FireWire port for my external drive which is almost always connected. If I ever need to disconnect it, I power off the iMac before disconnecting.

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