Is there some kind of a proper way of disconnecting a PB from a monitor? I usually just unplug it all out and then take it with me. I open up my PB and find its on a black screen as if its still connected to the monitor. I press the Power button making it goto sleep, wake it up again and then Im stuck in a blue screen with no login window. Im then forced to reboot the whole system by holding down the power key. Is there some special technique that I should be aware of?