After a series of random shutdowns my Macbook will not start up anymore. Instead i get a flashing folder with a question mark on it. I read this has something to do with the hard drive? I know I should try booting the computer using the Install DVD - the problem is there is a disc stuck inside. the computer won't start up so i'm not able to eject the disc what would be the best solution? would buying a new hard drive and swapping with the old one be a good idea? my computer is no longer under warranty I have my files backed up on Time Machine.. if i get a new HD, will I be able to transfer my old files from my backup external drive?