You are on the tv's component input. If the button of the remote that says video won't show you the other sources on the tv do it by the buttons on the side or top of the tv that say source. Go to analog or digital depending on the broadcast you are receiving.
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That situation clearly indicates that no signal is coming to the set in its present setting. Have you checked to make sure that the tv's input is set on the right input setting. Mine always defaults to "Antenna" which drives me nuts cause I get that big blue screen with "no signal". It seems to do that at the slightest provocation, too. After 5 years, I still have to think twice before checking it. If that is not it, make sure that the cables are plugged in. If that doesn't fix it try another type of input such as HDMI or S video, composite, etc - one that you are not using. Don't forget to switch the input to it. Good luck!
The bluescreen is an indicator of "lack or absence of a video signal". In TV mode this would only come on if your reception quality is so poor that the TV "thinks" there is more interference/noise than intelligent video signal nd therefore mutes the video. In all other modes, (S Video, A/V Video etc), again, this muting action will result in the bluescreen if the TV "thinks" it is not receiving any video input.
To try and fix this would either be:
1. Check and verify that you have a video signal coming into the TV by trying your video source (DVD, cable box) into another TV unit; or
2. Check and verify that your connectors at the back of the TV and the source are properly connected and are snug/fitted properly.
If both fails, it is possible that you have component failure inside the TV and that would require the services of a qualified TV professional.
Hope this be of help/idea. Post back how things turn up or should you need further information.
Good luck and kind regards.
Usually the blue screen is an indication that the video signal to the TV is not present. Most of the new TV's have a video input selection button on the TV and on the remote; try changing the video input selection.