Haha, I've been pulling your leg, the confused response was just too funny to ignore at first. I have a new comment that explains it.
You're good, and yes, it is older than 2e.
My bet is on either thermals or power supply.
Not likely to be RAM, since issues there are more likely to either prevent the machine starting in the first place, or lock up if it fails while the machine is in operation.
Not likely to be CMOS battery since that generally wouldn't cause the machine to shut off, it just preserves firmware settings between power cycles.
In theory, there could be an intermitted short happening somewhere and the PSU's OCP is kicking in, but I've never come across something like that. Similarly, there could be a problem with an internal power cable connection doing the same, but it sounds like you've already checked that.
I would test with a different PSU if you can. Thermals should be easy to check for too with the many pieces of available software to keep track of such things.
I've never understood the "these people hate Star Trek!" take I've seen around the new shows. It's clear that nobody working on these sets out to intentionally make a bad show. Some of the Easter eggs and references are deep cuts, so it seemed obvious to me that the people working on these are big fans.
To give credit where it's due, RotS and many of the Disney-era Star Wars products have gone a long way to fitting the glamorous, shiny prequel aesthetic into the gritty, used, "lived in" aesthetic of the OT. I'm not the biggest fan of The Last Jedi, but I actually think the implicication of the shiny galaxy just being a property of the rich inner rim planets was a great move in unifying everything.
Just to kind of push back on this, you're probably taking in and processing a bunch of information about your interactions subconsciously. Not all of us are able to do that effectively despite our best efforts.
It may be simple, but it really isn't easy for everyone.
This, at least, is not entirely true. OD&D does not have any distinction at all between male and female characters in the original 3 pamphlets.
Pretty sure that stuff came in later, post-Greyhawk. It certainly showed up in fanzines of the late 70s, though...