Check the laptop's BIOS/UEFI configuration to determine if the HDMI port has been disabled at the firmware level. Access the BIOS menu by pressing the F10 or Esc key during startup and navigate to the 'Advanced' or 'Video' configuration tabs. Confirm that external display output is enabled. Additionally, verify if the current chipset firmware version is outdated, which may prevent the motherboard from successfully initiating the handshake with external displays.
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