Randomly decided screen was not going to turn on anymore.

Hello,

My laptop randomly decided screen was not going to turn on anymore.

It turns on, if I wait, then hit enter and put in the password it logs on, but the screen will not turn on. I connected it to a monitor via hdmi and vga and it doesn't swap over (tried the Fn key + F4).

any suggestions before I just replace it. ( satelite L850 btw)