Assess the physical integrity of the HDMI cable and the laptop's HDMI port. Inspect the cable for visible fraying, bent pins, or connector damage. Check the port for accumulated debris or loose mounting. Confirm the monitor is set to the correct input channel (e.g., HDMI 1, HDMI 2) using the monitor's physical OSD buttons. Test the setup with a secondary high-quality cable to isolate the failure to the cable or the port itself.
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