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Hello I just did an install for 50 foot HDMI cable . It was stamped active on box and had a direction label on one side. Of course one of my guys removed the label and snaked it through the ceiling . And it did not work. So I reversed it and it worked . Can someone here please explain what is taking place. . The only idea I have is there is some kind of amp or repeater chip some where in the cable . And it gets it's power from one side only . So as it must be the video device as apposed to the tv. Someone please explain.

Thanks.

Al D