when i watch tv shaw 1080p cable box my dynex 46in tv is reading hdmi 480p, black bars top and bottom. or zoom mode whatever. then i change input to ps3 and my tv reads 1080p. what the heck. my other tv, 58in panasonic is getting repared so i switched them, same cables same spot but my panasonic would be 1080p on the shaw box and ps3. what am i missing.