A bit of a rant (sorry, I've been cooped up too long!)
Or the guys working through Craigslist fix anything for $45.
Oh lawd....

I had one of those two months ago come in.
Imagine if you will: a beat-to-Hell-and-only-a-15-year-old-would-buy-this case, FULL of dust bunnies (with nasty big pointy teeth!) and an obviously OEM HP motherboard, a no-name PSU, and a smattering of components to round it out (including totally mismatched RAM modules!). Oh the cable mismanagement...!
Despite that, it was running Windows 7 Professional 32-bit, poorly, and had Office 2010 Professional.
How much did this entire machine cost, with absolutely NO CoA or restoration media?
$200. Grand total out the door, from a local 'computer guy'.
Yeah. Seems legit.
Don't worry, I let the customer know she was ripped off. In fact, the reason she'd brought it in was that it was randomly restarting. Right away, I identified the bulging electrolytic capacitors on the motherboard, and showed the customer. She was NOT happy, of course, but she appreciated my immediate honesty about the situation, instead of bemoaning the machine or harping on about pirated software on the PC. I showed her Microsoft's own piracy reporting page, and let her take it from there.
Ah, sorry, rant over. I just really...despise jerks trying to make a quick buck like that! Makes all of us in the profession look bad!