Hello and thanks to everyone who regards for my problem.
My new laptop restarts on any stressful activity (like playing games, or 3D Mark test) if have my power supply cable on. If I do these activities from the battery, everything works perfectly fine.
CPU and GPU temperature, just before the crash, won't get high. CPU stays around 40-70, GPU around 40-50.
Link for the video example of the problem:
Question: Do you have any idea of what could cause this problem? And is it possible to fix it? How much would it cost?
Yesterday I got my hands on this second hand laptop, from a guy who was selling it on the internet. I met him in the mall, who shown me if laptop works properly. We played witcher 3, he ran 3D Mark test, because I asked if he can download it before we meet. Everything was working properly, I handed the money and left. But when I tried to test it at home, with the power supply cable on, computer was shutting down every time I was doing anything stressful (playing Witcher, running 3D mark test). As long as I was using it without cable, everything were working properly, jut like in the mall. Now this guy won't answer his phone, or reply on my emails, so it looks like a scam....
i7 6700hq CPU
16GB (2x8) RAM 2300mhz
GTX 1070 8GB
1TB HDD. Windows 10 Home (looks freshly installed)
Charger is original (checked).