I have a proscan and when you are watching a show,the channel goes to channel 4 and the blue screen with the words"signal" come up and I have to hit input and it goes to TV and I have to put it back

A blue screen indicates no video signal is coming in, Check your source menu.

Select the input channel for your Fire TV - Turn on your TV and select the input channel for the HDMI port you used to connect your Fire TV. You should then see a loading screen with the Amazon Fire TV logo 4.

A blue screen indicates no video signal, if you change the video input to a DVD player is it still a blue screen? If yes then the TV is defective. If no then some how the signal is being lost to the TV from whatever source you use for watching broadcast TV

hit the source button again that is for your scat press down to 1 HD should get you back on.

Sounds like a firmware corruption. Contact the authorized service center for Proscan, or any experienced service technician, to do a firmware update. Gopakumar Gopalan Google

it could be that your scrolling the channels and ports for your dish network menu and not your tv menu if your using a remote try changing the setting via the tv itself, also try disconnecting the dish network supply then try try using the net gear stuff, personally I would say get the new x-box one system because it has blue-ray capabilities, stream music and videos, movies, it has Netflix and hulu and all that stuff that your computer and phones can do now including video chat, voice recognition, hands free movements recognition and yeah it just does everything... hope this helps

Do a factory reset.
https://www.youtube.com/watch?v=S4j90hbPftc

The lightning probably zapped the tuner in you set. If no signal is present the screen is muted (BLUE).This is a feature to prevent your seeing snow on the screen. Stargazer

My panasonic Tv pic suddenly turned into a blue color I can't see the pic any more just can hear the audio.....any solutions????