Okay, I am trying to fix my cousin's macbook pro that she got for free. She only has the laptop and nothing else for it and it's about two years old. Wen I try to start it up I either choose the wireless network or login. After both of those things I get to the blue screen and that's it, or I get to the background with nothing else on the screen. I've tried doing safe boot and it still does nothing. I need help!