Had 3 Tv's W/boxes Connected Yesterday. 1 Gets Only A Few Hd Channels. Why?

Not getting the hd channels I paid for. Can't reach Comcast all day. No agent available for hours. No chat service online works. What kind of service is this?

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How do I hook up Cable TV and my VCR?
... you choose to your TV If you would like us to handle it at 1-800-COMCAST (266-2278). This flexibility may require two (2) converter boxes, a splitter, and one converter box Connect the other wire from the splitter outputs to the second converter box Connect a wire from the main cable into your cable service, Comcast will take care...
Troubleshooting Your High-Definition
... to chat with an agent. No picture on HD or video channels Double-check all programs are connected with HDMI or component cabling in order to chat with an agent. to the set -top box on HD channels Ensure that you are using HDMI or component cables do not pay for HD service , your problem, Can view HD channels...
Connecting a Set-Top Box or Digital Adapter (DTA) to a Media Center PC
... OUT, OUT TO TV, OUTPUT Connect the other end of this connection is usually called: CABLE IN, IN FROM WALL, or INPUT . Connecting a Set-Top Box or Digital Adapter (DTA) to a Media Center PC To connect a set-top box or a DTA to your Media Center PC, you aim the remote control to change channels and sound levels...