I have a Macbook (bought in 2007) running OS 10.6.7 and connected to an LG 37LC41 by HDMI. It was working perfectly for a few months until I played with the screen settings... Since then, having tried all setting options on both the TV and the computer, the best picture I managed to get is with very high contrast colours and it will not even use the full screen. I have tried factory reset of the TV, System restore, etc. and nothing seems to work. Please help!