Laptop turns on but has black screen

My Lenovo laptop tens on but there is no display it just doesn’t work please help

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Hi,

Can you hear the Windows startup sound (if enabled)?

Connect an external monitor (TV?) to the laptop's HDMI port and check if there's a display on it when the laptop is turned on. Don't forget to press the F10 key (or Fn + F10) to toggle the display between the laptop screen and the external monitor.

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