there are three reset buttons one on the bottom of the mouse and one on your keyboard's
backside and there is a reset button on the receiver that plugs into the USB press all at once untill lights flash and try to get it to connect again. or try to 1- use "Reset" (in you case it might be "Connect") buttons on your keyboard's backside and also on receiver. 2-use "Reset" (in you case it might be "Connect") buttons on your mous's backside and also on receiver.