|>>|| No. 27680
Fortunately computers are not people, so there's very little practical or ethical dilemma in a bottom up, time-saving diagnostic process. With humans, the fact that you can't just swap bits out until you find the culprit is why diagnosis can often be such a time consuming and troublesome process.
That said most people who give tech help online are completely amateur and the way they advise you to troubleshoot is backward. YouTubers are horrible for this too and they're who a lot of people learn from. I used to work on a tech support phone line and it taught me that you have to think outside the box to look for the simplest culprits, and ways to rule them out, before you go fucking about with anything else- That's the real reason the tried and true "Have you tried turning it on and off again?" exists.
Plenty of phone calls went "Okay, first of all, is it plugged in?" "Yes, of course it's plugged in, I'm not thi- Oh. Sorry. Yeah, that'll be it."