I got a 3 year old white macbook. I was surfing the net when suddenly it turned off. On restart, I got the grey screen for a while, the a picture of a file with a question mark in it, waited for ten minutes, still the file. I have done the following: 1.- Reset the PRAM: I use the combination of keys, and it reboots, but on rebboting it goes back to the picture of the file. 2.- Use the option key on startup: I get a grey screen with the curso on it, which I can move with my mouse, but no buttons to click or nothing. 3.- Use the X key: as if doing nothing 4.- Resseting the SMC: as if doing nothing What are my options? Can anyone help me please, I really can´t afford to be without a computer right now!