So I thought my macbook's hard drive crashed last month when a folder with a question mark didn't allow me to use it. I got it replaced, but shortly after, the problem persisted. I thought it would be the connection between the hard drive and the main circuits, so i changed that wire. It worked again for a couple of hours, but then my computer froze and the question mark popped up again. I bought an enclosure and am now using it with my original hard drive that i thought crashed. I have no idea what to do with my life right now. Classes just started and I need this piece of technology. Someone help me.