Question What are the possible effects a power surge made on my PC?

[pannonian_sailor]

In these times of great confusion, once again I come to you guys for help.

A couple of days ago, my dad was doing something and he turned off a fuse and back on a couple of times (twice, I think, turned it off and then on, off and on again). Meanwhile the pc was working in the other room when the power was interrupted. As the fuse was off for a short time, the pc turned off and tried too boot up again when the power was cut off, again. Next time I tried to turn the pc on, it would not turn on, would provide no video signal or mouse/keyboard response. Still, the pc was powering on, the ventilators were spinning and the motherboard light was on.

Nedless to say, we brought the pc to the repairman, who said there might be a chance to fix it. My (and my dad's) question is, what component could have died in the pc, if the psu seems to be working? My dad is an electrican, and his logic is that if the power surge would have brought more charge to the pc than it should have, it would have affected the power supply before anything else, and it should have broke down first, or stopped the charge from going further?

I know my question might be stupid, I just tried best to learn more. I did warn dad multiple times about the dangers of suddenly powering off the pc this way but you know how old people are. If it is of any use, the pc is an SFF, with a 200W platinum PSU.

 

[hotaru.hino]

Regarding power supply designs, most of them have the AC side electrically separated from the DC side (that is, you shouldn't find continuity from the AC to the DC side). In addition, there's usually a few safety components on the AC side to help cushion against surges and whatnot. So if something happened on the AC side, then it likely wouldn't have an effect on the DC side. But really, the only way to make certain of this is swap the power supply and see if anything behaves weirdly.