after deleting my bootcamp partition i had to press the option key to select my Machintosh HD everytime i turn my mac on, so i inserted the mac os x installation DVD but the disk only spins for 20 sec and it stops and does nothing... and the only thing you can see is the apple in the middle, so i tried using a bootable flash with the mac os x intallation dvd and the samething happens... any ideas? THANKS