Hi there I have a MBP 13", about 1.5 years old. For some reason I can't get any internal HDD to work in the computer. I'we tried 3 harddrives including the one that came with the computer and they all cause the computer to freeze. I can though run the computer on an external hard drive without a problem. But it only works if there is no internal hard drive in the computer, otherwize it will freeze after a short while. I'we tried reformating the hard drives, but it...