If you recently connected or added TV or audio equipment, make sure the color of the connectors match the color of the plug-in ports. If used, secure HDMI digital cables they provide HDTV picture and sound.If used, secure HDTV cable (typically red, blue and green connectors) they provide HDTV picture.If used, secure loose video cable (typically yellow colored) it provides picture.Tighten loose coax cable connectors (the ones with threads) they provide both picture and sound.If you don't know which option to use, select each option one at a time by pressing the up or down arrow on TV front panel or use the TV remote control. Options may be labeled Cable TV, CATV, CAB, Input 1, Video 1, Antenna 1, AV1 or some other name. Select the correct option for your TV if you know it. Press the INPUT button (may be labeled TV/VIDEO SOURCE or Antenna) on the TV or use the remote control that came with the TV.you may need to change the INPUT back to the TV. If TV was recently used to play video games, VCR tapes, DVD movies or home camera movies etc. VCR on Channel 3- With the TV ON and the VCR ON, use channel button on front of VCR to select Channel 3 most commonly used channel but you may need to try Channel 2, then Channel 4.TV on Channel 3- With the TV ON and the VCR ON, use channel button on front of TV to select channel 3 most commonly used channel but you may need to try channel 2, then channel 4.If picture did not return, go to next step. Turn VCR OFF- With the TV ON turn the VCR OFF and DVD player OFF, if installed.If this did not correct the problem proceed to the next step. If device does not turn off, then change the batteries in the remote control. Next use the remote control to turn off the TV or cable box. Manually turn on the TV or cable box by pressing the power button on the front panel.
Check: Remote control batteries are good.If power outlet is controlled by a wall switch, make sure the switch is in the ON position.Make sure they are plugged in all the way. If power is on look for loose or disconnected power cords.If not working you may be experiencing a power interruption to your home.
Verify lights and other appliances are working.Using these steps will correct most but not all your cable TV problems.