Recently I tried using a LCD television to watch a movie off my MBP, while the display was easy to format and connect, the brightness was very low. I tried to brighten the TV by switching things like the resolution and colour, and after every alteration, the screen would brighten to regular brightness quickly and then turn dark again. I put it down to being the TV, but the next day after the same thing happening with a projector I new it must be my MBP. Both times I connected with my DVI cord and used the display settings in system preferences. Why is this happening?