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
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Press the "Menu" button on the remote control and use the arrow buttons to scroll down to the "Parental Guide" option, then press the "Enter" button. Type in the default parental code "6688" if you have not set your own code. If you have set your own code, type it in. If you set your own code and forgot it, override it by using "6688." Use the arrow keys to switch the parental lock to "OFF." This allows all programs to be viewed no matter the rating. Press the "Exit" button on the remote and start watching all your channels
Somehow in handling the remote control I pushed a button or combination of buttons and now have a blue screen with a lock symbol in red in the top left hand corner. I've tried turning the tv off, and unplugging it, as well as a combination of buttons on the remote, but it still is there. What do I need to do to remove the lock?
the exact same thing JUST happened to us, my daughter unknowingly pushed a button, or a combo of buttons on the remote, we got the blue screen with the lock in the left hand corner, tried ALL of the above (we have the same tv, insigna, only 2 yrs old), I typed the problem in on the net and got the solution, pressing the display button worked!!! Thank U who ever knew this!!!
It sounds to me like a child lock function, which is usually what the screen + padlock is on TVs. Usually your original remote would have a button / sequence to unlock the mode. If you still have your original remote, look for a child lock button or refer to your remote manual (and/or TV manual for the child lock feature) to unlock the mode.