Black screen on startup Linux Mint after installation

Hello, I wanted to install Linux Mint Cinnamon on my laptop
After disabling secure boot and setting my USB key as boot 1
I installed Linux Mint, I decided to install the drivers for my graphics card by following this tutorial

https://linuxconfig.org/how-to-install-nvidia-drivers-on-linux-mint

So in the tutorial, at one point there is a command to run << sudo telinit 3 >>
but then my PC crashed

So when I restarted it, I saw the Linux Mint logo and then after 5 seconds the screen went off
I waited 5 minutes and it was still the same, the screen was off
So I pressed the power button on my computer and then I saw the Mint logo loading
and then the PC turned off as if I had pressed power

I looked online and I couldn't find anyone who had a similar problem
I also want to mention that the grub does not display
I have to press escape at startup for it to show up

I also modified a line in the grub so I could see the command lines with the [OK] in green at startup
So when I turn on the PC, the Mint logo appears, the command line shows up, then the screen goes off but the PC is still on, so I press power and the command line displays and the PC turns off

I have tried reinstalling Linux Mint several times but I still have the same problems, thank you in advance