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You selected the issue: Unable to Access GPU (Error 109/Error 400)

Your monitor may be unable to access your GPU. Both the Vive and the primary display must be connected to the same 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.
Reboot your headset
  1. Right-click on the headset icon in SteamVR
  2. Select Reboot Vive Headset
  3. Wait for the reboot process to complete