I'm aware that using the Fn+F3 shortcut lowers the backlight, but my F3 key actually no longer works. It's not a driver issue, it's legitimately broken. I'll replace the keyboard when I have the money, but for now I'd just like to turn the backlight off. Any way to do that through software or am I doomed to suffer this minor inconvenience until I get a new keyboard? I'm running Windows 7.