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Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
On the original tv remote, at the top, do you see a button that says TV/Video, or source, or input, or AV?If so, can you please press that. You may need to do so a few times to switch between the different input modes to get back to the signal from the box.
If you get stuck let me know.