So you say this happened when you installed the Verizon cable box? And you can see them on cable and wii but not on computer? This would rule out the tv, if it was you would see them in every input or source. Have you tried an HDMI cable from cable to tv? Maybe your component inputs are no good.
Media room- LG 4K OLED EG9600, Pioneer Elite VSX-90, Samsung 4K K8500, Klipsch Gallery G28's, Klipsch Sub 12, Klipsch RS-52 II, Optik HD cable
Living room- Sony 4K 79XBRX900B, Onkyo RC-360,HTPC, Klipsch Reference R-62II, Rc52II,PS4
Gaming room -Panasonic ST60, PS3, Wii