PC consistently turns off when playing

This has been happening consistently every time I boot up the game and load up a save now. I can play for about a minute or two before my PC shuts off completely. I have done appropriate checks on the hardware to check if anything is overheating, along with stress testing using other games. This has been happening for a while now, and I’ve decided to try once again today after completely giving up on the game for about a month.

Now, I actually have a auto-save file which crashes immediately on load, and will upload the file if I can find out where it is, or if someone can tell me. The thumbnail for the save is just a black mesa logo.

This issue did not start immediately, and I had got up to the chapter ‘Questionable Ethics’ and had just left the scientists in the lobby when this bug started appearing. I attempted to replay from one of my earlier saves (situated in ‘On a rail’ and after a while of no problems, that started experiencing the same issue.

This issue has not occured with any other game.

I could not find any logs.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.