I am ,unfortunately, pretty sure that the 500 gb hard drive in my 2011 13" macbook pro has totally died. It makes a loud clicking noise (like this: http://www.youtube.com/watch?v=oAlKi6OW9yY) and it shows nothing but a flashing folder with a question mark on it when I try to start it up. I stupidly haven't backed up my files in longer than I can remember, so I'm not incredibly hopeful about recovering them, but it would be nice. I don't want to pay whatever ridiculous price a genius will charge me to replace my hard drive (though I have an appointment with one tomorrow for some advice), so I have a few questions. What hard drive should I purchase? How do I reinstall my OS? Is there any possible way to recover my files? Thanks so much!