Screen black or with zero brightness

Hello, I have a razer blade 2019 advanced 15 I closed the cover of my laptop without closing windows system and when I restarted it I got a black screen. If I press for long time the start button and then I restart it I can’t even see the Razer logo. I noticed that if I am extremely close to the screen I can see the windows but with no brightness infact I can’t navigate though the windows. Please tell me what I can do. ps: I did no changes to the system or something like that... I was watching Netflix, I closed the cover and when I reopened it screen was black. Thanks Simone