I use my MacBook with an external monitor whenever I am at home, but this morning I decided to take my MacBook with me to class. I just put it to sleep and disconnected the ext. monitor and the rest of the wires. When I took it out just now, I ran Safari but it seemed like the browser window was still 'on the ext. monitor'. I tried to Detect Displays, but could not get my computer to realize that there was no ext. monitor connected. I finally had to restart my computer to make it act normal. Do I have to restart my computer everytime I want to use it sans ext. monitor or is there something I did not do?