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You selected the issue: Flickering

Black flickering usually means that the HDMI cable is faulty and can't get a good signal to the display

Remove converters, AV receivers, and switches from HDMI path
  1. Remove any device that is converting or rerouting your HDMI signal from the Steam Link to your display
  2. Run a straight HDMI line from the Steam Link to your display
  3. If a direct line improves the situation, try power cycling each of your signal conversion and receiver devices before reintroducing them into the signal line
Replace HDMI cable
Try replacing the HDMI cable that came with your Steam Link with another (preferably thicker) one to eliminate the cable from causing problems.
Edit NVIDIA xorg.conf file (Linux users only)
Open your /etc/X11/xorg.conf file, then add the following line under the "Screen" section:

Option "metamodes" "1920x1080_60 +0+0 { ForceFullCompositionPipeline = On }"

Save changes and exit.