I`ve been repairing & building PC`s for about 8 years. I really only do family & friends now. I once built a PC for a neighbours son, then, about 2 years later, it came back, faulty. When I opened it, the cables were tied up with bits of string, screws missing, etc.
I took a look. The CPU had been forced in & lots of pins were flat. One securing clip from a simm was missing, & the agp card wasn't in properly.
I asked her who had been tinkering with it, she swore blind no one had touched it since I built it. I gave it back, as it was, & told her to get someone else to sort it. I take a lot of pride in my machines, I use cable ties for a neat job. She returned a couple of weeks later, apologizing, as, apparently, her son, who she thought the sun shone out of, had semi stripped it, & re built it.
She ended up with a new mobo, CPU & mem. (DDR). Oh, & a good look at her 15 year old sons screen saver, & folders marked "Dans Porn".
Never heard from them since.