Ok I shutdown my iMac (newest one, with thunderbolt, and Lion), at about 130AM like an hour and a half ago. And it was taking a while to start. When it finally started it said I had no hardware installed for airport and all of my files were gone. THen I restarted and everything is seemingly back to normal. But I am wondering WTF triggered that and etc. I am so freaking out. Please help please.