I replaced a dead PSU but a new one lived only 2 days. What could kill it? Mobo, or sth else? There wasn't any visible problems with electricity at the apartment. What is most probable? How probable is that the replacement PSU was somewhat oddly, invisibly bad? Anybody had such experience like mine? Till now I thought that only PSU could kill other parts.
A non good brand PSU can die for many reasons:
Power surge (aka lights going out at home or high volt spike) is the most common.
Better Psu brands normally are quite fine vs those.
I have a thermaltake thoughtpower 700W, wich is not "one of the best brands", and yet its been with me for 3 years np. (And my family tendo to turn on 2 much stuff so i get about 40-50 lights out a year).
Another thing that can damage the PSU=Climate, humidity, extreame high heat in ambient temperature (note that non good brand psu are normally made for 21C ambient).
As far as i know good PSUs even if are rated 700W, can produce more if needed (dont expect them to work for long in that case), but cheap PSUs would try to produce more power and die in the effort.