I am a student. Because we still have Vacations, I turned my MacBook on, launched my Applications (Safari, Nambu, Skype) and then closed it to go Eating with my family. When I came home, I typed in my Password and nothing happend. So I shut him down via the Power Button. I tried to boot it up again. It takes a while to get to the Apple Logo, and then it shows a kind of “NO!” Symbol (http://www.harrisonburg.org/HHS/mac_screen.jpg)I googled and found the Option-Command-P-R Thing, but it gets Stuck and even with the Power Button, the MacBook WON’T TURN OFF!
Could you please Help me`?