Try using a different HDMI or DisplayPort port.Also try connecting the adapter to the PC before connecting the headset to the adapter. If you're using any adapters to connect your headset to your PC, make sure they support Windows Mixed Reality and are 4K capable.I am getting a 'Check your display cable' error

The headset flickers between black and the correct display.The headset audio cuts out or becomes glitchy.The headset display briefly shows a blue screen and then turns black and Mixed Reality Portal restarts or completely de-enumerates during use.Try using your headset without extension cables if: If you're using these cables, the Mixed Reality experience may be affected because of variances in signal integrity and bus power between your PC's USB controller and the Mixed Reality headset. Windows Mixed Reality headsets don't officially support the use of USB, HDMI, or DisplayPort extension cables. Can I use USB or HDMI and/or DisplayPort extension cables with Windows Mixed Reality headsets Go here for a list of supported adapters. My computer does not have an HDMI and/or Display Port If your headset is sleeping and clicking the wake up button does not work, restart your PC. In this article My Headset will not wake up

Multiple headsets on pc