1. Check the Connections: Make sure all cables are securely connected to both the monitor and the computer. This includes power cables and video cables (HDMI, DisplayPort, VGA, etc.).
2. Switch Inputs: Ensure the monitor is set to the correct input source. Use the monitor's menu buttons to cycle through the available input options.
3. Restart Devices: Turn off both the monitor and the computer. Wait a few seconds, then turn them back on.
4. Try Different Ports/Cables: If possible, use a different cable or port to see if the issue is with the cable or port.