Command Key Not Working

My Command (CMD) keys are not working on my iMac.
It doesn't matter what application I am using and I've tried different keyboards with the same result. I checked my startup items and nothing is there. Login as different user, same problem.
Potential clue: this machine had been used as a demo computer for conferences/expositions and I suspect that the prior owner did something but I can't tell what.

Check whether you have the plist file in the
'Home Folder>Library>Preferences'folder.
1. com.apple.keyboardSetupAssistant.plist
If it is there then try removing it and restarting the Mac.
It appears like the the software is broken. More specifically there is an apple software update for the Keyboard firmware update which needs to be installed. If it is already installed in the computer then probably you will need to try a disk repair from the install disk or an Archive and Install.
Check whether the software is installed here.
1. Click Apple and Open System Preferences
2. Open Software Update
3. Click on Installed updates and check whether you have the firmware updated.
Also note that the firmware update alone may not resolve the issue. You will need to install the latest Mac OS X 10.5.7 for the update to effect. This can also be done as a software update.
Good Luck

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