I just found a working macbook with a broken screen being sold for $60 on craigslist. I asked the seller for specs and she said she doesn't know the details except for the model # (which is A1181). It comes with no power adapter or software. Is there any way I can I test the computer to know if it is worth buying when I get there? I want to make sure it is able to run properly before investing in a screen. I have a 13" macbook. When I was at the apple store today, the employee was able to run diagnostics on my computer with his MBP without having to touch my computer. (Edit: There was a cord running between both computers, and my comp. was running, but everything was being done through his OS). Is there an easy way for me to do the same thing? That is probably too time consuming and unrealistic, so any other suggestions for testing the computer are welcome.