DisplayPort and HDMI come in different versions, which means you must also check the manufacturer for requirement details to ensure you have the correct cable.Try a different signal cable to confirm you are not dealing with a bad cable.Disconnect the signal cable from both ends, wait about a minute, and reconnect it again firmly.Check the signal cable connection between the monitor and the PC's graphics card.Use the monitor's built-in controls and select the correct input port.
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