If a button does not light up when pushed in then it may be that the LED has come out of its socket. You can check this by removing the plastic lens cap (simply pull off) and making sure that the LED is correctly seated. If the LED has come out, re-insert it with the legs in the horizontal plane and replace the cap. If it still won't light, remove the cap and take the LED out of the socket, turn it through 180 degrees and re-insert it. Put the lens cap back on and see if it lights now. If not then please contact us for further info.