How old is old? Just because there are fuses instead of circuit breakers doesn't mean that the wiring is necessarily dangerous. I think maybe you need to get an electrician or qualified electrical inspector into the building. All we can do...
A bit of a long shot here, but try removing the CPU and replacing it. This sounds a bit like a bad contact somewhere. Since you've had the RAM sticks in and out, it's probably not on the memory contacts, although it wouldn't hurt to pull them...
The CPU is a 9600K? I was going to say just drop in another two sticks and let them run at the slower speed, and then I saw "I don't want to fart around with it." For minimum farting-around, even if it's only potential farting-around, pull the...
Power in my area is stable but I have a wife that doesn’t understand circuits and power budget. She routinely plugs her hair tools into the master bedroom outlets instead of the bathroom because the bathroom gets “too hot” our equipment closet is...