If the lens cover is unable to turn on the Mars 3, please follow these troubleshooting steps:
 

1. Open the lens cover and check if the battery indicator light flashes before closing. If it does, charge the device for at least half an hour and then try again.

2. If the lens cover does not turn on the projector and there is no low battery indicator, plug in the charger and try turning on the device with the remote control. 

If this issue persists, please contact us with a short video showing the issue if possible. Additionally, please mention that you have already tried the listed steps to avoid being asked to repeat them by our team.