the Keyboard backlighting on my Dell 7567 stopped working a few days ago, I hadn't downloaded anything new or updated the laptop that day. I have checked in the mobility center and when I try to move the keyboard brightness slider it instantly jumps back to the very left side, and when I try to run the BacklitKB.exe it gives me an error saying "Unable to detect the backlight keyboard" any Idea how to fix this? Thanks