I am thinking of buying a unit that doesn't work. It is a total "?" because the owner is not mechanically or electrically inclined. How much is the unit worth? What would it be worth if I got it to work? And what should I look for that will tell me the unit is toast? Here is the ad: http://sfbay.craigslist.org/eby/tls/1543761322.html. Your advice, and opinion is greatly values, and appreciated. Thanks.