Locked tv. Hello my tv is locked and dont know what to do. The screen is all blue with a red key

Question

Hello my tv is locked and dont know what to do. The screen is all blue with a red key on the down left corner of the tv. None of the buttons work on tv or remote just the power button what should i do?Hello my tv is locked and dont know what to do. The screen is all blue with a red key on the down left corner of the tv. None of the buttons work on tv or remote just the power button what should i do?