>>312164989
Have you reinstalled the firmware of the headset? Grey screen is caused by loss of tracking so if the firmware has been installed properly, the base stations are visible, and the headset is getting enough power, it should track.
[spoiler]Another possibly dumb thing is it might be the proximity sensor inside the headset not detecting you're wearing it and turning off the screen. Cover that up with opaque tape and see if that fixes it.[/spoiler]