Please help, I took my 40 gig hard drive from one computer and installed it in another for my son so that he could use it for games. It was setup as a slave with because there was another hard drive in it already. Everything worked fine. My son decided he wanted it back in the other computer so that him and his friends could use both so I removed it, changed it to a master and put it back in the other computer. It now locks up when I get to the part where I choose start up normally. There are a lot of files on the drive so I would rather not re-format if I don't have to, please help.