One reason I always buy a decent PSU. Protection, stability, efficiency and longevity. They pay for themselves eventually in the hassle they save.We had a power surge approaching a year ago. It was enough to blow appliances in 40 odd houses around here, and I was sat in the house literally hearing light bulbs explode, and electrical goods frying.
Once everything calmed down and got sorted, tried to turn the pc on and... Nothing. I was gutted as I'd only built the thing about a year ago.
Replaced the psu, hit the power button, and.... everything was absolutely fine. PSU went, but bore the brunt and saved the rest of the machine.