I remember also a little story about smoke and some small fire and a PC.
We had a customer (kind of friend and smart ass who always wanted everything for free)
who had problems with his PC.
He said his PC smells strange and sometimes got bluescreens etc.
So I went to his house and saw where he placed his PC.
Inside a closed drawer in his desk (see. the little pic I made in a hurry
)
He made just some tiny wholes in the backplate for Joystick and mouse and Power cable
and there was not really much space (nowhere) around the whole PC.
And the front door was also always closed and above was a bookshelf filled completely.
I:
I asked him if he ever opend it and cleaned it because of dust etc.
as this can be a problem especially for the PSU.
And that it is not really a good idea to place a PC inside such a surrounding
He:
No problem I got a clean house and this can't be.
The PC is running in there for almost 4 years without a prob.
I:
Oh oh plz. just let us have a look inside the case to check it.
So he got the PC out of the desk and wanted to do it more or less alone
Plugged the power cable in and I said:
NO wait I first want to look inside because if there is to much dust in the fans and PSU etc. the whole PC can burn down because of things like this or if the fan is working completely your CPU can be destroyed etc. etc. bla bla.
He:
Llaughed and said he didn't believe me and that I just want to sell him new stuff.
Then he turned the PC on and said do you hear that strange noise and now wait a bit then the smelling will start.
Then after 1 minute or so a few small flames came out of the PSU at the back and I grabbed the cable and pulled it out of the socket. Tehn there were only some small clouds of smoke.
Then I said: OK I do see what you mean, now I can smell it too (
)
TBH this was the first and only time I saw real flames coming out of a PC/PSU and by god I saw and fixed and build hundreds over the years.
In the end he bought a new PSU from us and inside the PC where lots of dust bunnies.
Man the piece was really dirty inside.
But nothing we couldn't clean with our compressed air cleaner.
He nowadays puts his PC on the desk instead of inside
so I think he learned at least something from it
happy easter everyone 
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