Function keys stopped working

in Genius Bar
How do I turn standard function keys on?  They're not woking.

Googling the problem doesn't help. I get these suggestions:

"Whether you are using the Magic Keyboard with Numeric keypad, or the regular Magic Keyboard — you can have direct F-key functionality, and when need the meta functions (e.g. mute, etc.) then you press the fn + F10 combination:"  

Since I'm using an iMac, there is no Fn on my keyboard. Can't find suggestions for iMac.

"Alternatively, you can open System Preferences : Keyboard panel and uncheck Use all F1, F2, etc. keys as standard function keys. Then, you can access the meta functionality directly on these keys. When you want the F1, F2, etc keys, you use fn+F-key."

Keyboard panel does not have: 'Use all F1, F2, etc. keys as standard function key". 

What else can I try to make function keys work?

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