Operating System Not found

This is an odd one. I was just watching a stream on Twitch when suddenly my system just powered off. After turning it back on, i was stuck with "operating system wasn't found. Try disconnecting any drives that don't contain an operating system" (mind you, this seems to be typical for laptops...

I have tried to install Ubuntu OS from USB stick but failed. All installation process going well and at the end it shows to restart laptop after installation and when I click to restart laptop, it shows: "Operating System not found". I have used several USB stickes, I have used "Rufus 3.6" and...