PC Keeps crashing randomly - No bluescreen - assorted event viewer errors - PLEASE HELP!

[Microsoft Windows]

Hi. The issue:My PC for the past month has randomly been shutting down and self rebooting immediately after. There is no bluescreen, there is no sound, no error. My monitors just go black and the PC fans start up again after 1 second. It's very jarring. What I've tried:-underclocking the CPU-Fixing hundreds of event viewer errors including loads of "The application-specific permission...", (although I've checked event viewer after a crash and there's loads of warnings within the span of a minute)-Lowering RAM speeds-Updated literally every driver I have-Reinstalled Nvidia drivers (t

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