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I'm afraid it's not good news. The technical term for this is panel tab bond failure. In non-tech terms... basically, there are ribbon cables in your TV which are soldered permanently on one end to the panel by a robot. Either in the assembly process, bad solder, poor shipping, etc... one of these tiny joints has failed.
There is no way to repair this - the panel must be replaced. Usually it costs as much as the TV did when new to replace a panel - and not usually recommended for repair unless covered under warranty.
HOWEVER - I find Samsung to be very good to work with on these sets. If you call them up and treat them respectfully... and tell them what a LOYAL samsung customer you are - and that you expect a major purchase like this not to fail in 2 years.... etc etc etc.. often times they will extend the warranty coverage on the panel... cover the cost of the panel if you pay labor, or split the costs 50/50.
Sometimes there is also a silent recall on the panel and the only way to find out is to call them to complain.
There is not a magic reset that will get this going again without the line. It requires repair (or a sledgehammer). You will likely find over time that more lines in the same area will begin appearing.
They will set up a service call to verify the diagnosis, and then decide what to do about the replacement.