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The blue light on the receiver, that indicates HD service
If the TV is HD, and the feed from STB to TV is Component Cables, the Blue HD Light will ALWAYS be on when the STB "Aspect Ratio" setting is set to an HD output (720p or 1080i)0 comments
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The blue light on the U-Verse box is because you have HD programming available. If you shut the box off or wait until it goes into sleep mode, the blue light will disappear.0 comments
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It means HD has been selected on the box. Are you using an HDTV?