Power off the laptop and unplug it
Check the screen for dirt, pressure marks, or debris
Gently clean the screen with a microfiber cloth
Restart the laptop and test with different brightness settings
Connect an external monitor to check for graphics issues
Run a screen test or display diagnostic tool
Update or reinstall the graphics driver
Remove any screen protector if installed
Avoid pressing on the black spot
If the spot is permanent, replace the LCD panel
Contact the laptop manufacturer or a repair technician