First of all ladies and gents I am a complete mac newbie and computer newbie in general. Lately, my MBP has been taking a little bit of extra time to shut down. After clicking shutdown everything happens normally but then it goes to a blue screen with the little twirly thing at the bottom. Which means its thinking right? After doing this for less then 30 seconds it shuts down. It never used to do this. Should I worry, or is everything cool? Thanks for your time.