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You selected the issue: Headset display is black (no video input)
Enable Direct Mode
Launch SteamVR and go to SteamVR > Settings > Developer tab > Enable Direct Mode

Direct Mode ensures that your HMD is not recognized as a monitor. If you close SteamVR and the HMD display shows your desktop, this means that Direct Mode is not enabled. When Direct Mode is running properly, you will only see VR content in the HMD.

If you have trouble enabling Direct Mode, make sure that you've installed the most recent drivers for your GPU.
Check video port functionality and GPU connection
Make sure of two things:
  1. Both your main monitor and your Link Box are plugged into the same GPU
  2. Both your main monitor and your Link Box are plugged into functioning ports

In most cases, video ports that are side by side on your PC access the same GPU.

If you believe that the above are true, try:

  • Using different ports of the same data type for each device (e.g. change Link Box HDMI cable from one HDMI port to a different HDMI port)
  • Using a mini DisplayPort/DisplayPort cable or HDMI/DisplayPort adapter to plug the Link Box into your computer if the ports you regularly use are not detecting the device.
  • Using a DVI or DisplayPort cable instead of HDMI, or vice versa.
Optimize your PC settings
  • Update GPU drivers from Device Manager (Device Manager > Display adapters > Update Driver Software)
  • Unplug any USB devices that aren't being used
  • Disable power management in SteamVR (SteamVR > Settings > Developer > Disable Power Management)
  • Disable Windows Defender
  • Disable wifi adapter in Device Manager (Device Manager > Network adapters)
  • Set your PC to 'High performance' (Windows key > Type: power > Power Options > High performance)
  • Set NVIDIA power management to Prefer maximum performance
  • Reset CPU/GPU overclocking to default
Enable PCI-e graphics card in BIOS
To access your BIOS, restart your computer and hit the DEL key until the BIOS menu appears.

Here are some changes that may fix your issue:
  • Update your BIOS
  • Enable multi-monitor support
  • Disable xHCI in BIOS
  • Ensure that BIOS is setup to use only your dedicated PCI-e graphics card

The process for accessing the BIOS differs between computers. For further details, look up the process for your particular computer or motherboard.