Is that bad if you close the restarting laptop?

I'm reprocessing my old laptop for someone, I had to restart it. In the middle of the restart I closed the laptop and opened it again after a while. Now he's always restarting and nothing happens. Is it bad that I closed it while staring up again?

No, not at all, unless you have set a certain closing activity that is not sleep mode or something like that. But even then it shouldn't be a problem

If nothing happens in the next 3 minutes, just press the switch-off button for a long time (I always do it and nothing has happened until now)

No, you may have to do a software reset (ctrl + alt + ent) or switch it off by pressing the power button so that it starts normally again.

If necessary, there can be a note (on black screen) about an aborted start, whether the computer should start in safe mode, in order to solve any problem. But you can ignore that here.

Thank you, but it is still restarted after pressing the switch-off button

Take it back, I didn't press it long enough, now it's okay