Hi Constantine
I am Dave, an Independent Advisor, I will help you with this . . .
The functionality of FN Lock toggles the need to use the Fn key with the Function Keys (F1 - F12)
Boot your system into BIOS, check in there for an option to swap between Function Keys and Media Keys
A far as I know on that model, this is the procedure:
In BIOS, go to the Configuration tab and look for the "Hotkey Mode" option Toggle that to Disable the hit F10 or Fn+F10 to save and Exit