Yesterday we bought a LG Plasma PA45**, I installed and I set everything as per my wish ( like contrast, color & aspect ration). After 10 minutes switching on the TV there comes a advertisement of the TV in the top left corner and it changing all the features I set.How can I get rid of this non-sense.How can I make permanent changes in the features? what should be the color, contrast, brightness, sharpness that makes more watchable?