I am a mad centrex owner?

I have some how locked out my tv from the stupid remote, can any one help me to get it working again so I dont go gaga, from the kids screaming at me arghhhhhhhh, it has a red padlock up to the left of the screen I have sound but no picture and a blue screen, any help will be great short of buying a new one and throwing it out

Answer:
somehow a password is entered and locked. If you don't know the password then you will need the owner's manuel to get if back on by overriding the password.

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