Out of the blue, my F7, 8, and 9 keys, have stopped working while all others continue to work as expected.

I've toggled the Fn key checkbox in System Prefs > Keyboard and reset NVRAM with no joy, but I can't even begin to guess where to look next.

Any suggestions?

Thanks.

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In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire