The problem is this: I have a custom setting where the screen is dimming and closing in about 3 minutes of inactivity. However the PB 12" (using 10.3 by the way) is dimming the screen even while I am watching a DVD or a movie at Quicktime. Is there a way for the computer to sense that it is being used and not switch of the screen while I use either of these apps? thanks a lot for your help