have Sound; can view guide; picture is just blue circles - XFinity

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XFinity-Comcast channel programming, have Sound; can view guide; picture is just blue circles?, Have sound. When I press xfinity I get the options and dvr programs. When I press to view only a screen of blue circles but can hear program. When I select a channel same thing--have sound but the tv screen is all blue circles. Please help!
 
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