ok soo ive had my macbook about over a year and it was my fondest possesion. Now it is just pissing me off. My hard drive crashed so I replaced it and everything seemed to be working fine for a while. Now it continues to freeze. When I turn it on all I get is a blue screen and a cursor...after hours of staring at the blue screen I reinstalled osx. It worked at first but now its just blue screening again.. PLease help