Dimmer and volume keys not working on keyboard

I went to up my volume from the f5 key on my keyboard and it didn't work. I tried to dim and lighten the screen and that too didn't work. Any suggestions on how to resolve this situation?

Did you check your Keyboard Shortcut settings in Sys. preferences, Keyboard & Mouse perhaps something is off there.
*Your Question being marked as solved does not seem accurate, since you still have the issue with these 2 items.Hope this explains how to mark your Question / Topic Answers, Helpful and Solved
Eme;~[)

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