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Hello, Your TV is somehow set back to "Demo" model and to fix this you need the original Samsung remote.
Put the TV to the "TV Source".
Then go to the "Plug and Play" MENU, scroll down to "Home Mode/Demo/Store Mode" and select "HOME".
Then press OK and exit the MENU and select the SOURCE you normally view from.
Let me know if you have the same problem or need further help.
This is shown on page 7 of the manual at the link below for your set:
If you need further assistance let me know. Also, please do click a 3-5 STAR rating for my efforts before you go. That is how I am credited for my efforts by the site. You can follow up any time as needed at no additional cost.
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