Windows 10: My FN key seems to be broken

So Im trying to restore an old laptop. I bought a new keyboard because the old one seemed broken and when I installed it, my 'k' key was printing a 6. I found out that the 'k' Key behaves like that when you press FN, but when I press it myself it prints k normally again. I don't know if it's an motherboard issue or Windows bugging, but is there some kind of software/key combination to solve this issue?Thankful for any help!

:)

 

FN key always on

To clarify, I was saying "Accessibility" features maybe be controlled via the BIOS, not the Fn keys. And one of the Accessibility features makes the keys "sticky". This allows folks with some disabilities to press, for example, the Ctrl key, then the Alt key, and then Del in sequence instead of all at once. Same with the Fn key. The sticky feature would let you first press the Fn key, and then the F9 key (for example) and not Fn + F9 at the same time to enable/disable whatever Fn + F9 does with that notebook (it is the touchpad on my Toshiba).

 

FN key always on

Fn key got absolutely nothing to do with BIOS.

It just requires some bizarre combination. One of this should do the trick:

fn + scrl
fn+ num
fn + F11
fn + F8

 

FN key always on

If you press “Num Lock" (might also be labeled "Num Lk”) (I’ve also seen it labeled “Pad Lock” for numeric Pad) it turns on the blue keys, and inverts the meaning of the “Fn” key – it’s a way to use that embedded numeric keypad without having to hold down the “Fn” key the entire time. To fix it, just find and press the “Num Lock” or “Pad Lock” key again. (Note, sometimes these keys are themselves “Fn” keys, so you may, or may not, need to also hold down the “Fn” key to get the right function.) Often there is an indicator light associated with the setting.