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Check that the power supply cable is securely plugged in at the device, power brick, and wall outlet. Re-seat the power supply cable (or Ethernet cable is powered via PoE) at all connection ports. Verify that the wall outlet receives power.

Verify that the display is powered on, has the correct input, and that the HDMI cables are securely connected at both ends. Re-seat the HDMI cable at both ends, if needed. Power down or unplug the device from power for 60 seconds, then power back on. Verify that the connected display and HDMI cables work by testing them with other known working equipment.

Check that the Ethernet cable is connected at all connection points and that you are seeing communication link lights at all connection points. Re-seat the Ethernet cable at all connection points. Power down or unplug the device from power for 60 seconds; then power in back on.