I started having problems this weekend with my macbook freezing, though the battery level would still move as would wifi -- it just gave me the spinning circle. Every few minutes it would recognize where the cursor is, but then nothing. I booted it successfully in smart mode and shut it down correctly, but now it'll only boot to the wallpaper and no farther. I signed into a second account and it works just fine. I haven't downloaded anything over the weekend -- I was out of town and used it mainly for Hulu and checking Facebook. Any suggestions?