PSU Fan With Broken Blades Causing CPU Problems?

1. A properly mounted PSU should not have any influence on the cooling of the rest of the case.
2. The fan inside the PSU with 1/2 the fan blades broken off WILL overheat the PSU, but nothing else.
3. The CPU being actually damaged was some other issue.

PSU fan blades do not just break off. Someone was inside the system screwing around.
I would think that this screwing around also involved the CPU.

What was the make/model of this PSU?

In this sale, was there any warranty involved?

By 'warranty', I meant between you and the purchaser. "I sold a computer to someone "
Probably not, right?
Are you a PC business, or just some guy selling a used PC?

All sales final, no refund, you broke it, etc, etc.

Those PSU fan blades did not break themselves off. Someone was in there screwing around.

So what did cause the CPU issue?

what is the PSU mounting top or bottom of the case was the PSU mounted witht he fan to suck air internally or externally from the floor. could be something they set the computer on from the time they picked it up from you during transport poked into the PSU and broke the fan blades or something they set the computer on at the home such as a pen or pencil or paper clip poked into the psu and broke the fan blades when they turned it on. sounds pretty shady in my opinion, but i have no idea the conditions the machine was transported or how it was set up and if any one opened up the case and messed around inside, i don't trust kids, and you have to interrogate every one involved like a detective in order to figure out what happened.

either way the PSU has been critically damaged and should be immediately replaced, you can not have melted wire coating and exposed wires in a PSU those wires got so hot the plastic melted, it's not much more heat before the bare copper wire softens enough to move and contact some other parts and either melt them or destroy other parts or the whole computer and start a fire.

you can replace the cpu fan, you can put electrical tape on the bare wires and put heat shrink tubing over that, but if there was other damage to the PSU it might not help. not worth the risk unless you are an electrician in my opinion.

if you have any way of proving the machine was in good working order before i would ask carefully how it was transported and look at where it was set and the same with it's new owners home after it left your care i would tell the man what i suspected and about the psu and ask him to carefully ask the questions you asked him to find out if his grand son did something as curious children often do, if you could not determine if the grandfather did something, which can happen out of ignorance or negligence, but not on purpose such as children are want to do out of curiosity or tryign to do something their friends told them to do.

might be you find out the computer was set ontop or a blanket or in a blanket to hide the light and noise instead of the child or grand parent sleeping and or they fell asleep while sneaking and playing on it instead of in bed.... my friend had this happen this spring when he stayed at his much younger cousins house, that relative has burned up a new ipda a new iphone and a ps3 as well as a laptop in 4 months gaming instead of being asleep and then falls asleep while gaming in his bed or with blankets and pillows covering the tv and the machines. the childs mother, the aunt is a lawyer so the kid is spoiled.

between my friend and me talking we were able to formulate questions in the right order to get the truth of what happened and determine the cause of the damage and extent of the damage.

So what did cause the CPU issue?

Yeah...overzealous OC without knowing what he was doing, and other abuse.