It is dark in the headset

①USB cable might not connected

Make sure the headset's USB cable is properly connected to the port. Verify Oculus (Meta) app is properly operating on the computer. 

②The senser in the headset is not work

Please wear the HMD so that your bangs do not cover your face. The sensor in the HMD is a reflective infrared sensor (near-infrared passive), so black light is absorbed, and if there is hair on it, it may not detect a human body and may not project an image.

Please contact your vendor or technical support for additional assistance by submitting a support request here.