Atother story about PC hardware and being... Not so careful.

A friend complained about his PSU fan being too loud. I said "well, maybe bearings are dying already".
The next day he messaged me and asked to suggest a new PSU. Ok, I threw him some links.
Leter, he told me what happened:
He decided to clean the PSU, because he thought the noise could be because of dust. So he turned off his PC and removed PSU cover with a screwdriver. While doing this, he accidentally hit the circuit board itself. Then "Puff", black smoke and smell of sth burning. Turned out he didn't switched the PSU off. Luckily, the screwdriver handle was rubberized. I'm glad he is alive ._.