adium froze, so i force quit it and restarted.....well now the computer freezes at the startup screen..........ive tried doing the shirt cmd opt del to boot fom my external but it doesnt work.........it freezes at the screen with the apple and the little spinning dial thing on the grey backdrop.....PLEASE HELP. im really worried since i dont have apple care....thanks.....help is appreciated asap because i have a paper i need to print out on it