Problem with keyboard - several keys no longer working

In the last few days my Macbook running OX X 10.5.6 stopped allowing me to switch applications via Cmd-tab (now jumps to the toolbar highlighting the first button) and switching between windows within the same application - Cmd-` does nothing now.
Also, none of the F key responds to the associated tasks.
I've checked the following
* Rebooted machine - reseated the keyboard USB into different USB port
* Screen Shared from my Macbook and tried same key combo (making sure keyboard not at fault) - same response
* Keyboard & Mouse -> Keyboard - "Use All F1, F2 etc keys as standard function keys" is un-ticked
* Keyboard & Mouse -> Keyboard Shortcuts - Clicked on "Restore Defaults"
* Universal Access -> Keyboard - Sticky Keys OFF, "Enable access for assistive devices" is un-ticked
Still the problem remains. Any help will be gratefully received.

Thanks a lot for helping. I did a software update and plugged the keyboard in a different USB port. After restarting, everything was working again! Not sure which of the actions fixed the problem, but I'm relieved.
Thanks again.

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Problem with keyboard - several keys no longer working

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