Why is my laptop not displaying external monitors through the Thunderbolt port?

1. Check that the Thunderbolt port on the laptop is active and enabled.
2. Test the connection with an external monitor or device known to be dependable.
3. Determine the correct settings for the external device.
4. Check the laptop settings for audio and video interface.
5. Update drivers for graphics card, audio card, and Thunderbolt interface.
6. Run the system diagnostics from the BIOS menu.