Hi. So last night, my Macbook started to show a folder icon with a question mark on it when I tried to boot it up. I tried to restart a couple different ways, using the Install disc, and when nothing worked, decided to reinstall OS X entirely. Well, after the first disk finished installing, it said to restart the computer and be prepared with disc 2. Unfortunately, after the restart, I just get a blank gray screen, while my optical drive makes short repetitive noises. Any advice on how to get the reinstall to work right?