10-30-2013 05:44 PM
There is a button on the top of the keyboard which a picture of a joystick. If that is on, it stops the Windows key from working. This is so you don't accidentally push it in a game and leave the game.
10-30-2013 06:00 PM
when the little switch with the joystick on it is to the left the Windows key should be enabled. at least that's the way the G510 is, I assume the G510s is the same way.
try moving the switch back and forth a few times. if that doesn't help, then it sounds like it's defective and you should contact Logitech customer support to find out about warranty information.