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Hello, On Samsung sets the button to put the TV to a different Input mode is the "Source" button. Now, you haven't posted any details about the set, so depending on how old it is- it may not have this button, but if yo can postback with the model number off of the back of the TV then I can help you further.
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Please be patient. You posted back 11 minutes after I engaged you and I stepped away. I am looking into this now if you need help. Let me know.
On the original TV remote there is a "TV/Video" button you use to change the source settings on the TV. Now this is an older set, and I cannot actually see a picture of the set anywhere. Can you look on the front of the set for a "TV/Video" button please?
Or if there is NOT one there, then get me the Model and Make off of the front of your ATT box so I can look up the remote (they have several so I have no way of knowing which you have).