Laptop switches on briefly and then off again?

Fl
3

I had a problem with the fan on my notebook. This was defective, so I replaced it, I was also very careful. But now I have the problem that my notebook always switches on briefly (1-2 seconds) and then immediately off again, this happens endlessly. It's not the battery either, I have already unplugged it and connected it directly and have the same problem. I have a Xiaomi Mi Notebook Air (2018), does anyone have any idea what this could be?

gu

Does he have any other software or hardware problem? Or is nothing known?

Fl

No not really

gu

Strange, strange: - /