Hey so i'm trying to set my mac book up to two HD T.Vs, first is a 42" LG LCD, and second is a 50" Sony Bravia. i have it set up with the mini DVI adapter to RGB. the problem is that both t.vs will only work with the mac book resolution at 800x600, 60hz. and on the t.v the sides have thick black borders and the top touches. how can i fix that?