Turned it off and back on and it started working again. Only discovered this as I was boxing it up to return it to Dell.
Otherwise, the mouse works fine.  Easy to adjust speed using that button behind the wheel. Keyboard LEDs work fine but it seems the mouse ones burned out.  Uninstalled and re-installed the control center. Tried another computer. Wish it was the keyboard that went out because I would rather have the dark one. Only had it for 2 days.
AW610M, LEDs stopped working after 2 days?