It's impossible for me to reset my laptop

[Deuxice]

I got a second-hand Lenovo g40-30 laptop this week and it was good as new but yesterday as I was just browsing through internet then suddenly my desktop background just went white and froze. The screen was unresponsive for more or less an hour so I just shut it down with power button. But the next day I open it, login screen is invisible. I can’t login. On top of that, it is so unbearably slow that I can’t do the Shift+restart for me to troubleshoot. Is there a way I can “manually” reset it. I tried Shift+restart many times, it can’t register input as it is very very very slow.

[Bruce]

because you don’t know the history, and what may be left on the drive, I’d be doing a fresh install of Windows.

download the Microsoft Media Creation Tool and use it to create a bootable USB stick with Windows on it.
then boot the laptop from that stick and reinstall Windows.

[georgeks]

How to Reset your PC to factory defaults - Lenovo Support HR

[phillpower2]

Thread closed due to lack of any feedback from the OP.