Hello,
I am having the exact same problem. Tried eveything possible as per OP's post, nothing made the headset's display come back. I've noticed the headset is working though. For exemple, if i launch the VR in Microsoft Flight Simulator, my main display shows the stereoscopic view and if i move the headset around, that view moves accordingly. It is only the display inside the headset that won't turn on.
Also tried to roll back GPU drivers, tried other Display Ports on my GPU.
Everything has been working fine for more than two years, but suddently this happened.
Specs :
Windows 10
GPU : Asus 7900 XTX
CPU : AMD 5800x3D
Ram : 32GB DDR4
PU : 850W
SSD : Samsung 980 Pro m.2
If anyone has a clue as to how to fix this problem, please let us know !
Thanks in advance