HDMI "Not connected" problem on the Oculus rift - No solution - YouTube
Plugable Active DisplayPort to HDMI Adapter - Connect Any DisplayPort-Enabled PC or Tablet to an HDMI Enabled Monitor, TV or Projector for Ultra-HD Video Streaming (HDMI 2.0 up to 4K 3840x2160 @60Hz)
Motherboard HDMI Not Working (Troubleshooting Guide)
Oculus Rift S Won't Work On Laptops With Only HDMI : r/oculus
Oculus Rift Troubleshooting Guide - VR Geeks
Top 7 Fixes for “No HDMI Connection” or “HDMI not Detected” Issue on Your Oculus Rift | Driver Talent