Ensure the correct button is being pushed (power button vs. mode button). The mode button will not turn the handle on. Also, if there is not a brush head on the handle it may not be easily heard. Try placing a brush head on the handle and turning it on. A final option is to place the handle in the charger and charge for 24 hours before turning it back on. If the handle still does not turn on, click here to register your product for inspection or contact our Customer Service.