If the device is not plugged in or fully charged it will not work properly. Plug the device into the wall and try to turn it on. Check to make sure charger light is on as an indication that the charger is in working order. Note that the trimmer will not run if it has not charged for at least ten minutes. For more information visit [[Philips Norelco MultiGroom 3100 Troubleshooting#Section_Device_won_t_turn_on|Philips Norelco MultiGroom 3100 Troubleshooting Page]].