In the last month or so, my computer has started to crash randomly during innocuous activities like browsing and listening to music. I don't get a BSOD or an error screen, just a black monitor followed by the splash screen from my motherboard booting up again. I've enabled memory dump files, but none are getting written. It's definitely not insufficient cooling - I never see my temps rise above 50C on my GPU or CPU, even when running 3dmark.
I've checked my hard disk and RAM for errors, reinstalled windows 10, updated my video drivers, and nothing seems to make a difference.
One thing I do find interesting is that I've found that I can deliberately trigger the crash by trying to play certain games, notably Pillars of Eternity and Torment: Tides of Numenera. Those games load up and start as normal, but the crash triggers as soon as the game engine begins displaying anything other than text.
Originally, I was thinking it might be a problem with my PSU, but the fact that I can trigger it reliably with a certain game (and not a particularly strenuous one), leads me to believe it might be something else.
Any ideas? I'm at a bit of a loss - I've built my own computers for almost two decades now, and this is the first time I've experienced an issue like this.