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Hello, This can be caused by a few possible things. In order to help you, can you get me the model number off of the back of the TV please?
Also have you tried swapping out the HDMI cable with a new one at this point? That is one of the most common cause- since these cables are digital and can cause "lockups" on these sets when they fail.
However that is only the first possible cause. Please reply back and we can proceed.
Are you still with me here?