I had some help. I asked nearly everyone in my environment who built his pc on his own about this topic. But I did the work alone, and the pc still works. Ok, some pieces are a bit worn out by now ...
I pulled my PC to bits once, trying to get at the fan to pull it out and measure it. I need a new one if I want to run a webserver, because my current one makes more noise than a lawnmower
Got it in 1999 to use as a family computer, then last year we got a shiny new one, so I put the old one in my study to try and get Fedora on it. Now I need to put it in the cupboard and connect it to the router, but I'm not allowed to until I get a quiet fan.
1) Our fridge has broken, we've been waiting for the fridge man for 3 weeks to come and give us a new one.
2) My fridge is too far away from my router.
3) The new fan is green and glowy