pc crashing when launching games

This has been happening for quite a while now (around 2 years), and it happens on the loading screen of games, usually when a screen that says 'Press ... to start' and sometimes in the menus. The PC just black screens and restarts. I previously got rid of the issue with a factory reset, but this...

So suddenly the other day, like 2 days ago, my pc keeps crashing when launching games. The game freezes and when i open task manager it crashes to. I can click everywhere just without anything happening. I haven't changed anything before it happened. It just randomly started. My specs: CPU...