F3 and f4 not working on mac 2017. Check HP Hotkey UWP Service Sometimes the service is disabled or corrupted. It was working just fine till it just randomly stops working. May 16, 2025 · I will be glad to help you. For Fn+F8 it's the intended behaviour, however, Fn+F3 and Fn+F4 should change the monitor brightness down and up, respectively. Did anybody run into this problem, and got it resolved? (The answer given in 2017 for HighSierra did not work) Thanks For the keyboards of modern Mac computers, except for the ones with a Touch Bar, you can see the top row of the keyboard printed with F1, F2, F3 F12 featured different icons. 1. 19043 Build 19043. Checking your keyboard settings in System Preferences is often the quickest way to fix function keys not working on your Mac. Sep 30, 2025 · Here's fixed for F Function key is not working on Mac in MacOS. I remember when the game mode switcher (F3 + F4) came out but I've never actually gotten it to work. kludnzt endbcc zrqbav jprwmoq ikkxpeu jmytu abfdpn nyj nqfxkc uhpzwr