Ok, so I'll say again, apparently it lacks logic. But the HDDs, mobo, controllers etc. are all interconected. So, when one faulty component starts introducing weird spikes in the system, any other component can go boom. Usually is the PSU, but when that is strong enough, the weirdness begins. The electronics in a PC is way to complicated to tackle it so simple. I had a case when a faulty graphics card has fried 5 network adapters until we (me and two other coleagues) figured it out. When elemetary logic does not apply it doesn't mean that there is no logic at all. It could be a more complicated logic, not understandable by me (and you, maybe) because we don't have the knowledge to fully comprehend the phenomenon.
So, long story short, when I encounter a case with no obvious resolution, I start testing even the craziest ideas. It payed off many times.