Nothing happens when pressing any of the cells

If your LEO's mode button seems to be working fine, but nothing happens when you press a cell, then the membrane is probably turned off. Please follow the instructions below to turn the membrane back on.

1.  Insert an overlay.
2.  Hold down the mode button for about five seconds. The LEO will beep twice and all of the lights on the front will come on and then go out.

The cells should work again.