I can't get my MacBook Pro to start. Here's some background. i did a dixk verification (in disk utilities) - got a message saying i needed to clean my disik using the external / install disk. When I try to start the computer, either without the intsatllation disk or with it (pressing the shift key) - the progress bar goes to about 30% and then quits. (i've also got kernel panic on this machine... help!