Ensure that the charging power supply is plugged into a power supply. Then, make sure that nothing is wedged between the charger and the charging socket on the cushion (e.g., the cover or dirt). It is important that the charging power supply and the charging socket are clean.When the charger is connected correctly you will hear an ascending tone sequence. After a short time, the cushion’s lighting will turn off. This is intentional so that the light does not disturb you at night.