Yes, despite often being a bit cheap 'n cheerful, PSUs are pretty robust in themselves.
But if the input voltage goes out of spec so might the output voltage on one or more rails, and things like memory chips are not particularly robust.
Ok so after all this time (look at date i started this post) it has just been fixed today.
The circuit board was melting on the inside including a cable. Electrician has been out and changed it and everything should be fine now.
So this is how i found it out. I was in shower and suddenly it cut off then came back on then off. i was like "woa ok what is this" and jumped out shower turned it off and saw hall light turning off and on over and over so rapidly it was as if it was trying to give me a seizure. I ran to the circuit board and immediately before i opened the cuboard it was in could hear crackling sounds coming from inside it.
When i opened the door to circuit board i could see arcing from behind the switches that turn stuff off and it was NOT turning itself off. I immediately then turned every flip switch off including the master.
So circuit board replaced with new one. Old one is "melted" and now house electrics seem ok. I am hoping this is the end finally of my electrical problems.
Edit: I just thought, since the circuit board was not tripping itself out for over 20 seconds at least, if i had not been home would it have burned my house down? It smelled of burning when i was flipping all the trip switches off.
I wish i could remember the name of the company or person who installed that circuit board. Today's electrician said the polarity may had been reversed, whatever that means, or cables had been miss wired or touching. He was not sure of the exact cause but said it was def the circuit board causing it and had most likely been fitted wrong because he said it was a good one that rarely goes wrong if fitted correctly. It was about 6-7 years old.
I got to today's electrician to right me out a report of his thoughts and findings on it but alas i can't remember the company or anything i used 6-7 years ago to report them or something because that was dangerous.
Edited by blackmesa8 (Tue 22-Nov-16 14:53:17)