I have a 30" ACD hooked up to my 2.33 C2D MBP. I got a question. When I change the brightness via the controls on the display, that little black square doesn't pop up on the screen telling me how much my brightness has changed. How do I get it to show up? Also, how do I get it so that pressing the "on" button on the ACD puts the entire system to sleep, instead of just turning the monitor off?