Thank you for reaching out to simplehuman. We will be more than happy to assist you with your sensor mirror. Let's do a quick power cycle on your mirror:

1. Press and hold the power button on the bottom of the unit for 3-5 seconds. You will see a red light flash to indicate that the mirror is now off.
2. Wipe the sensor (dark-tinted window on the light ring) using rubbing alcohol and a microfiber cloth.
3. Make sure there is nothing within 6-8 inches of the sensor.
4. Press the power button for 3-5 seconds to turn the unit on. You should see a green light flash indicating that the mirror has been turned on.

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