1234 Views 1 Reply Latest reply: Nov 19, 2007 9:23 PM by CherryBlossoms
I had the same issues when I bought my macbook pro a few weeks ago.
Its a feature built in that dim and brightens the screen with an ambient light sensor.
The sensor is underneath the speakers so when your hand goes over and effects the lighting your screen will dim/lighten.
To turn this off go to System Preferences > Displays
then at the bottom it will say Automatically adjust brightness as ambient light changes, uncheck that.