Troubleshooting My Philips Multigroom does not work If your Philips Multigroom fails to switch on, this can be due to several reasons. Please try the following to determine the problem. The device is plugged in Philips Multigroom can only be used without cord. If it is plugged, unplug it and try again. The battery is empty When the battery is empty, you need to charge the device for 15 minutes before you can turn it on.