To solve this you must reset your keyboard, for that unplug your keyboard off the usb port and press and hold "Esc" + "Caps lock" + "Spacebar" for a few seconds, plug it back in while holding, a green wavy-like effect should appear, unplug it again and repeat the steps, your keyboard should be working fine now.





If it still dont work, one thing that worked for me was to go on Synapse and change my key lightning to all white for 30 secs, then spam "fn" + "O" then i unplugged my keyboard, plugged it back in and it was working as new again.







Also make sure you have your synapse up-to-date, that might also cause problems too.