I bought my CV and TOM from a guy, both working, but had a ton of issues. First thing I did was check out the boards. He seemed interested in this, and asked what I was looking at. I noted some of the issues and where they were generated. He didn't have a clue.

We then went into another room to use his computer to transfer the money via paypal. I notice a massive bench with crap loads of very high tech electronics equipment. I asked what he did, and he noted he was the head prof at a local electronics school.

...yet he never tried to figure out the 15 year old pinball stuff, and was selling due to them not working right.