Hey guys... some weird problem developed a few days ago.. My ibook g4 display will not automatically dim and go to sleep when im not using it. So my battery life is liked sapped to the max because the display always remain on as though im actively using when, when in fact im not. Tried using System preferences, to adjust it, but nothing works. I find it really weird why its begun having this problem when it worked fine all this while. Help please?