Anyone had any success getting a walk-in appointment at a Genius Bar? My Mac Mini is not booting again, after I just had the hard drive replaced a couple months ago. It is 7 AM in Alaska, and according to the website, there are NO appointments available today. I live 2.5 hours away, but am headed up there anyhow (kind of a last minute trip), and wanted to see if I could get in this afternoon to have it looked at. Anyone know how easy it is to get a walk-in appointment?