Hello, I am new to this forum, but my Mac has went down and I would like some answers. I have a 13" white Macbook, and about two days ago it just shut down as I was using it. When trying to restart, a flashing folder with a question mark inside flashes and nothing proceeds from there. I tried putting in my restart disc and that didn't do anything. I believe that it is my hard drive, and if not, please let me know. But if it is the HD, where is the best place to get one that is cheap, but still a decent quality HD? Any help would be appreciated, thanks.