To prevent potential injury, the bowl and blender have safety interlocks fitted so that the blades cannot be accessed while the product is in use. The attachment and lid need to be locked in place for the machine to operate. To do this, ensure that the attachment and lid are aligned, and turn to lock until you hear a click. When correctly assembled all icons will be lit and the screen will display \'00:00\'. If you see four dashes on the screen display, then the attachment or lid are not properly locked in place.