HDMI cable run in wall from DP to DP - Dell Community
Test HDMI cable and display port cable
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Amazon.com: 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 @