Depending on your HDMI input, this is probably not an issue. HDMI black level should be set to 'Normal' if it is connected to a PC, or 'Low' for most other sources (eg. Blu-rays, DVDs, game consoles). When the TV detects the 'Normal' range it will prevent you from changing it. We recommend labelling the input to 'PC' to disable most of the image processing, for the most accurate result. Adjust the 'Backlight' to your preference, as it doesn't change the picture quality. Adjust 'Color Tone' to your preference, we prefer 'Warm2' but you may prefer a cooler setting.