increase brightness results in dark screen
One normal day I turned on my Macbook and my screen was completely dark, as if it had given problems in the backlight.
Today after some time with it turned off, I turned on HDMI and it worked on a second monitor
When I unplugged the HDMI, the Macbook screen turned on again, but if I increase the brightness to a certain extent, the screen turns black again.
What can it be?