Hi! I have two major problems: 1. When I try to either log out or shut down via the menu, the screen will go to blue then go back to where I was- WON'T SHUT DOWN! 2. The Airport icon has disappeared off of the menu bar, and the only way I can get online is through Coconut Wifi. What's going on? I've reset my PRAM, but didn't fix anything. Help!