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I have spent the day trying to get a Pro HD up and running. I have been trying to connect to a Comcast DVR made by Motorola. I finally called support and if I understood the tech correctly, some cable boxes that have HDMI connected to the TV block other outputs. It is my understanding that in order to use the Pro HD I would not be able to use an HDMI cable for my TV's HD input. Can anyone confirm if this is correct?