How can I normalize my laptop?

I have deleted my internet through a comment from you. I entered something with internet.exe and now nothing works. Niente Nada. Request for urgent help.

Did you try turning the device off and on again?

Could you explain that a little bit more?

I have deleted my internet through a comment from you.

Well, what comment of "us" should that have been?

I can't find anything in your profile.

Yes, after that only a black screen could not do anything

I have tested a command and now the screen is only black. I can't do anything anymore. I left the laptop to the computer science teacher.

Not comment. I mean a tip for the command how to command something in the cdm. Without thinking, I tested it. Now only a black screen with the cursor. I handed over the laptop to a computer science teacher.

Which tip? Please put the link so we know what it is about.