my problem: whenever i mute / unmute the volume to my LCD the screen will go black and then back to normal all in about .5 seconds. it doesn't matter if i click the speaker icon in the task bar and click "Mute" or if i simply slide the volume to 0%. it will flicker going to 0% and once i un-mute / raise the volume FROM 0% it will do another .5 sec flicker. is this a known issue or is my card defective? while recording it doesn't show any such flickers, so it seems like a signal issue with my TV and the GPU?