dionb wrote on 2025-08-22, 12:35:

What happens if you don't short black&green before you plug the PSU in and then short the wires afterwards?

Nothing, if I plug it without shorting pins. Didn't try to short after, because then I would need to be very close to PSU when powered on, which I don't want to 😀

Believe me or not ..
I would not deal with any PC power supply.
Or any switch power supply in fact.
I've been playing with electronic since 1990, I know a bit, but those things are a pain.
Sure some here know more then I do. But I would not spend time on this.
This kind of supply involve a lot of things to work.

I know about electronic ...
It's even been my job.
That's why I suggest not to try to repair this, since you have no tools and no experience.
It's cheap, get a new one.

Really, your old computer deserve love, not a dead power supply that will kill everything 😀

nali wrote on Yesterday, 03:38:

That's why I suggest not to try to repair this, since you have no tools and no experience.

People trying to fix electronics without basic knowledge and proper tools is very common. Nothing wrong with asking for help when you get hopelessly stuck but expecting people to give you step by step instructions when you can't even identify certain parts or don't even understand how the circuit works is just asinine.
I cringe when I read someone is trying to fix a CRT but asking where the deflection circuit is or how to use a multimeter to find a short.
Instant gratification rarely works in electronics and sometimes you just have to accept the fact that building knowledge and experience takes time and effort.

Guys PSU is working, it's my extension cable that has a short which I didn't notice!

boby wrote on Yesterday, 10:42:

Guys PSU is working, it's my extension cable that has a short which I didn't notice!

That's why i said earlier - when a breaker pops - investigate, do not just retry it. This was one failed breaker (as i said - they do not like being tripped repeatedly) away from burning your house down and/or causing injury.

In normal conditions, unless a fault exists somewhere else, PSU should not be able to trip the breaker. It has its own fuse which should prevent that.

Archer57 wrote on Yesterday, 10:51:

boby wrote on Yesterday, 10:42:

Guys PSU is working, it's my extension cable that has a short which I didn't notice!

That's why i said earlier - when a breaker pops - investigate, do not just retry it. This was one failed breaker (as i said - they do not like being tripped repeatedly) away from burning your house down and/or causing injury.

In normal conditions, unless a fault exists somewhere else, PSU should not be able to trip the breaker. It has its own fuse which should prevent that.

There are a lot of devices connected to that extension. And everything works perfectly, when I plugged PSU in, fuse popped out. It was clear to me that it is PSU. But yesterday, I was turning on and off extension cable to see something and then the fuse went down again. PSU connected direclty to to the wall socket started it up without problems.

I am so sorry for all the troubles and not noticing something clear.

Thank you all for help.

Good news
What did I write: "Maybe a cable problem ?" ? 😀