Black screen of death!!!

Last night I was on a video call on Whatsapp with a friend of mine and all of a sudden the screen went blank.

I knew it didn't shut down and the camera was already on because I could see the green light. Just to make sure I asked my friend if she can see me or not and she said she can see me.

I had no other choice but to turn it off so I went ahead and did that. I held the Touch ID button until it turned off. But after I try to turn it back on, it's still blank.

I went on YouTube and tried basically all the methods that they mentioned. Command + P + R, booting in to safe mode, etc. NOTHING WORKED :(

It turns on. I know that. I hear the chime on the start-up. I enter the password. I use hotkeys to play music. All of that works but I couldn't see anything on my screen. What should I do?

I connected my laptop to an external monitor and it's working. Maybe it's a software issue? Or maybe there's a issue but not with the display? I know it's hilarious saying this out loud but, I think if I reset my mac, somehow it'll work. And there's a couple of reasons...

1. When this happened I turned off my laptop and turned it back on. I'll say I've restarted my laptop more than 15times now. But when I connected that external monitor, I could see the WhatsApp app was still running. I mean it was closed but I could see that tiny little dot under the app.

2. It was a bit slower too.

3. I couldn't go to the diagnostic mode. After I select the language there was nothing happening.

These are the ones I can remember. Can someone please give me some more replies? Thanks in advance.

MODEL - A2337