I recently acquired my friends macbook to try to repair it since it would not boot. It would boot and show the flashing question mark folder. I tried booting while holding shift and that did not work. I also tried using disk utility to repair the drive which it could not. After that I ended up trying diskwarrior and left it running for a day and a half and then eventually quit that. My main problem now is that I can not even boot from the mac install dvd to reinstall. I have tried holding down c but that does nothing. I have also tried holding down the option key and it just brings up a screen with a cursor and no options to boot from. Before I ran diskwarrior I was able to see both the harddrive and the cd that was in. Any ideas on what could be going wrong? Thanks for all the help in advance.