If you keep your eyes open, and actually want to (!), it's surprising what computer (and other) equipment you can find, just dumped by the road, usually near a bin. Pretty much all of the computers I use at home are from such places, some had no faults, others had minor problems that didn't take much effort to repair. Some of them I've upgraded a little, with 2nd hand parts from ebay.
Anyhow, the other week I found another computer in the street, next to a 1980's midi hifi unit with one speaker. I took the PC home, and had a quick look at it. It fails to start up - just beeps an error code I've not looked up yet. What amused me more was the impressive bodged repair. Have a look at the attached picture.
Clearly at some point the original smaller-than-standard power supply has failed. Someone has bought a new bog standard PSU, but - oh - it won't fit in the hole. What to do?
Well, why not hack a hole in the back of the PC case, and make it fit? I admire the way they've lined the PC case secondary fan holes with the fan holes in the PSU case! Though I think they lose points for failing to block up the hole for the original PSU.
Considering the amount of dirt inside this old PC, but the cleanliness of the PSU, I'd say it's pretty much new, so at the very least, I've got a spare ATX PSU for some future project.
Ian