I am having some problem with lion on my 2010 15" mbp. Recently it started showing a lot of beach ball and it would take very long time booting up. So i went ahead and reformatted.(I did not do that when opgrading from sl so it was properly about time). 1 day after the fresh install it started do it again. Just this time it went bad very fast. 3 days later and I can't boot at all. I haven't installed anything weird, I have made an apple hardware check and passed. The SMART status says verified and I have repaired permissions and disk. Further more, I have boot camp installed with win 7 ultimate. And that runs perfectly. Does someone have a suggestion? I'm about to order a new hdd but I would like to have someone else's thoughts?