Fn key is not working on Apple compact wireless keyboard

The fn key is not working on my Apple compact wireless keyboard. Keyboard Viewer shows the keyboard (incorrectly) as having a number pad but no fn key. How do I fix this? I'm running OSX 10.5.8.

Unfortunately my old Mini does not have wireless capability. So I could not test the keyboard.
I did however find two preferences files. I suggest you find them and trash them.
Disconnect the keyboard first. Then find the two .plist files. They are:
com.apple.KeyboardViewerServer.plist - this is in Users / yourself / Library / Preferences.
The other is: com.apple.keyboardtype.plist - this is in Library (root level) / Preferences.
After trashing both these, it's a good idea to restart the computer, and then once again pair the keyboard.

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