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Hi , I`m JackPerhaps I can help you with this tv problem but first I must say that I am not privy to any of the money matters or subscription or trials etc. etc. not an employee here but an independent tech. that gets paid by this website once you rate me for my help .
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Let me know when you are ready to proceed
Not sure what you tried so far but I need you to try this first ;
Unplug the TV's power cord and hold the power button directly on the tv ,keep holding it for 20 secs or so then let the tv sit unplugged for a couple of minutes before you try it again.Although i do not expect much out of this procedure , it has to be done to confirm that this problem can be cleared or not with a reset.If that does not do it then we are looking at internal problems with the tv.
let me know how that goes.
On those Samsung by the way the power button will be at the rear lower corner either left or right