Is there a way to keep a powerbook from going to sleep when the lid is closed? Not using an external monitor or mouse/keyboard to keep awake mind you. Or is there a way to turn off the powerbook LCD while it's open? Basically I want to watch movies in my larger external monitor but not be distracted by the bright LCD. Sure I can turn down the brightness, but that's a tad "tiresome." Basically I need something like the mute button for the audio but for the display. Any help?