Rift S Black Screen

culled from Oculus site 

If you’re seeing a black screen while using your Rift S headset, try these troubleshooting tips:

  1. Disconnect and reconnect your Rift S from your computer. To do this:
    • Unplug the USB cable from your computer.
    • Unplug the Mini DisplayPort or DisplayPort cable from your computer.
    • First plug your USB cable into your computer again.
    • Wait five seconds, or until the light on your headset comes on.
    • Plug your Mini DisplayPort or DisplayPort cable into your computer again.
  2. Unplug your Rift S headset and plug it in again. To do this:
    • Carefully remove the facial interface from your headset. This will allow you to access the cable.
    • Unplug the cable from the headset.
    • Wait five seconds.
    • Insert the cable back into your headset.
    • Insert the facial interface back into your headset.
  3. Restart your Oculus service. To do this:
    • Open the Oculus app on your computer.
    • Click Settings on the left-hand side of the app.
    • Click Beta at the top of the settings options.
    • Click Restart Oculus.