How can I stop the screen from dimming on my 15" Al PB? After about a minute it seems that it turns the screen down in brightness to about half what i had it set at. I tried the energy saver, and monitor preferences to no avail. Any suggestions? And while we're on the topic...it seems that when i'm navigating in column view in the finder, using the keyboard, i can only switch to the next column or select a folder by pressing the right arrow key. WHY?! why can't i use the command+O command??