1. Complete an environmental test. Click here for instructions.
2. Touch a Mimio stylus pen about an inch in front of the top ultrasound sensor on the Mimio device (this looks like a small silver circle on the side of the Mimio device). When touching down the pen, verify if the pen indicator LED on the Mimio device turns green.
3. Do the same for the bottom ultrasound sensor.
4. If the pen indicator LED on the Mimio device does not turn green when each test is performed, there is a dead ultrasound sensor which requires warranty service. NOTE: A dead or weak ultrasound sensor can only detect a stylus pen when positioned directly in front of it.
5. Contact Mimio Technical Support for warranty service instructions.

NOTE: If available, always verify if another Mimio device works in place of the original device.