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Why is there no video output?

1.Please make sure that the laptop is equipped with Thunderbolt 3/USB-C 3.1 Gen 2/USB-C 3.1 Gen 1 port(Supports PD), which supports usb c display transfer.

2.If it is Thunderbolt 3 laptop, please try to update system BIOS, Thunderbolt 3 driver, Thunderbolt 3 NVM firmware, and graphics (GPU) driver from the system manufacturer.

3.Ensure sufficient power supply to connect external monitors. 

4.Check the HDMI cable or monitor if can work properly.

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