F3 Does Not Respond in Minecraft
Solution 1:
You can always try reversing the function of the FN key (using FN + F3 for the multimedia option instead of the actual F3 function).
To do this you have to go into your BIOS settings.
Firstly, if you don't know how to go into BIOS you can hold down the shift key while clicking the reboot option on Windows 10.
This will get you into the advanced startup menu.
From there click troubleshoot and then UEFI Settings.
From the UEFI settings go to the Advanced TAB
From there you can change the function of the F* keys.
Choose Function key and you are good to go.
If this doesn't work, let us know.