“I recently purchase a Dynex 55 TV When I first turn on the Dynex 55" Tv, I did not choose cable box/satelite connection, I chose just cable. When I watch TV, parts of the picture quality is blurry even though I do use a HDMI cable. I now have a HD-DVR cable box from brighthouse with HDMI cable, do it matters if I selected cable connection instead of satellite/cable box connection? When I click on info, the HDMI says 480p sd, how can i get to 1080p since the tv is originally 1080p?”