Keyboard backlight not working

Hey everyone,

I've got a Dell Inspiron 15 that's giving me some trouble. The keyboard backlight isn't turning on at all. I tried hitting the Fn+F9 combo—which is where the light icon is located—but nothing happens. To make matters worse, I just noticed my Wi-Fi shortcut (Fn + F3) is also acting up and won't trigger.

Any idea what might be causing this?

If they just finished the install, there's a good chance they haven't even touched the Apple drivers yet.
And if someone’s been poking around inside, maybe the ribbon cable connection to the keyboard isn't seated quite right...