Hmm... back in '95 I acquired a used "conditioner" UPS (Old NASA shit.)... weighed almost a ton! (batteries?) Had 4 home built PC's... 2 were later confiscated for ALLEGED cracking activities. At that point I was going to rubbish bin that heavy dinosaur.
After discussing this with my Onan / Cummings generator man.... (I used a 4 cylinder Onan / With automatic transfer power box, all 500g tank propane driven.) He said, "Keep using it, as it was a fluctuating cycles that caused all the mischief with PC's." (I had it set to come to life 2ns after power loss for the farm.)
Irregular cycles / spikes of power... on/off/on medium/off... that the APC UPS probably didn't handle fast enough may have caused the issue with you're power supply.
That weird heavy 1/2 a end table sized hunk of junk probably saved my bacon a few times back then.
Just a theory mind you.
FYI... I have a Dell Win7 (server/workstation) and Dell Win10 (mini-tower). One I modded (yes, it can be done slightly)... if you know what your doing.
Even took some photos of it when I started... BUT, after seeing anon's mod photos... I just hung my head in shame...
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