Im having problems with my Macbook Pro and right now all I get on it is Utility. I erased my Macintosh HD and Lion wont install. Even though Macintosh HD is there any way I can erase ALL personal data from my laptop before getting it repaired? Will setting the erase to the 7 step erase everything? I'm going to be taking it to Apple to get repaired and I want to make sure they have no access to anything on my hard drive. Thanks!