My keyboard volume buttons no longer work (other function keys still work)??

I've never had any problems with my keyboard but after one instance of viewing a video (via my TV, where I selected audio device
as HDMI as for some reason it was still coming from my mac, which was not usual) my volume function keys on keyboard no longer
work.
When I press them they show they volume icon onscreen but it is grey and non-functional?
I've tried going to system pref and keyboard setting to ensure the function keys are all set as they should be but I have not had any
success so far. I've also played video through TV again and put audio settings back to mac, instead of HDMI, but still nothing.
Any ideas??

In the meantime, you could use Keyboard Viewer to type the characters which don't work.
You can open Keyboard Viewer via the Input Menu - that's the menu that usually displays a flag, on the right end of the main menubar. If the Input Menu is not shown in the main menubar, go to System Preferences > Language & Text > Input Sources and checkmark the "Show Input menu in menu bar" item. On the same page, at the top of the list of input sources (languages ≈ keyboard layouts) checkmark the item "Keyboard & Character Viewer".
With the Keyboard Viewer open, any letters you click on its representation of the keyboard will be entered in an open document.
Note - this can't, of course, be used as a substitute for characters needed for startup commands.

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