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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To change the aspect ratio to default, do the video reset (while in standby (red light). Hold the power until it beeps once for turning on then once again to do a video reset) After going into the video settings after the reset it should be there to change it. If you still don't get a picture try it on another TV. If there is still no picture you may have busted the HDMI port.
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!
blue screens are common when your set cant find a signal. might of switched it to video mode .find your menu on the remote and go to cable channels and press the autotune and should find and remember all usable channels
On some TV's the screen will go blue if there is not a strong, solid video signal present. This is to prevent the showing of very snowy or all snow channels, or garbled, mixed-up external video signals. This is normal. On some VCR's the video signal changes when the FF or REW search feature is used, and this could trigger the TV to go to blue screen. The only way around this if you can enter the TV's menu and turn off the blue screen feature.
You will need to go back into the menu and see what ia available in the video input mode. You may have switched the type of input you can use such as default or componts ect. If you have an isntruction manual, look in there or call the manufacturer, should also be in the instruction or user manual. Good Luck