Sorry I didn't explain that very well. The screen looks like it does when you are not actively using the computer but you are not away long enough for the screen saver to come on. I am using the computer. It looks like all you need to do is move the mouse and the screen will be bright but that doesn't happen when I move it. Could the mouse be defective? It still works except for that function.
Thanks.
Sounds like you may just need to go in to "Display" options inside System Preferences and adjust brightness settings.