WOW, lol. I have tried everything to get the led back on. It worked once after an uninstall and reinstall then went off again. Should have known, turn it off and back on again. The switch underneath worked right away, thanks.
I had this same problem and tried everything. In the end all I had to do was turn off the mouse from the switch underneath and turn it back on. I forgot about the switch and finally just stumbled upon it and it worked. 
AW610M, lighting stopped working, #4, fixed