So a friend gave me his boss's old Macbook Pro from 2009, model A1286, no serial number anywhere on the thing. Said the thing died and he couldn't get his files off. The computer was just giving the prohibitory symbol upon startup no matter what I tried so I just took out the drive, plugged it into my windows machine and there were the files, clear as day, so it clearly wasn't the hard drive. I suspect it's the cable but I'm not 100%. The guy said he didn't want it anymore so I wanted to get it back up and running, hopefully boot it off a USB. Everything I've tried has failed though. Tried internet recovery and every other startup key combo I've found online and nothing. The closest I've come so far is by downloading Mavericks and making a bootable USB with Transmac (I've got MacDrive Pro as well) and when I plug it in and hold the option key it will show it as an option to boot from but when I choose it the computer just keeps restarting. I'm at my wits end though, looking for any good suggestions of what to do. I'm not even sure the OS it originally came with, nor does the guy I got it from. I saw that the cable is only $20 but I'm not even sure that would help if I can't even get the thing to boot from a USB. Any suggestions? I appreciate any help.