New Computer not powering on,is it because of not powerful enough PSU?

bobafetthotmail said:

Blowing up (small bang and/or a bit of acid smoke) a crappy PSU isn't so uncommon, happens here around once per 4-5 months (more when we buy old hardware by the pallet). Closer inspection (after the offending PSU is left overnight in a bucket of salty water to make sure it's no more electrically dangerous nor burning) usually reveals literally blown (cheap) capacitors or bad soldering and burned stuff around it. Some PSUs circuit boards even got themselves on fire. Sometimes I wonder how did they pass FCC or whatever certifications they need to enter EU at all.

As far as 80+ PSUs I never encountered issues with various of your so-so brands like EVGA and Coolmax, but I have to admit that those were used in mid-level builds like the one in the OP, not gaming rigs. Never used PSUs above 450-500W for that.

I am not going to buy a PSU above 500W if I don't see a good reputable review of it, regardless of brand.

Even in mid-level builds, the PSUs that I would never recommend might eventually create problems with either stability or just weird and random problems at the software level due to the hardware being subjected to power that's dirty, noisy, and unstable over the course of a couple of years or so. It's worse when the average power draw on the PSU is extremely low, like so low that the efficiency is always below 80%. Cheaper PSUs like that aren't built well enough to handle that and eventually worse problems can start to surface (not always, but sometimes).

There's also this on Overclock.net:

PSU articles

It contains lots of educational articles, actually.