I use my iMac mini-display out to HDMI to my Panasonic plasma TV. Recently I was watching a 2+ hour movie in VLC on the TV, and the aspect ratio happened to mean that there were black bars above and below the image. When I turned the TV off afterwards noticed a little temporary burn-in of the black bars. I'm guessing that since my TV was representing the exact visual output of my TV, then these pixels in the black bars weren't just "off", they were generating shades of black for hours at a time. Anybody have any ideas about how to avoid this? Maybe VLC or another HTPC program has a way of changing the color of these black bars or some other anti-burn in mechanism?