i really need help. My macbook air was having problems, certain apps like pages would constantly give me the beach ball of death and it would not leave. In pages case every time i would right-click it would freeze and the beach ball would come up. I decided to erase my hardrive hoping it would solve the problem but now i can't start my computer. It's a macbook air so i can't insert the disk and i didn't exactly purchase mountain lion on my apple id so i can't reinstall the software. i seem to have hit a dead end please help me.