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Hi , I`m Jack an independent TV/AUDIO repairman with 40 years experience.Perhaps i can help you with this , please let me know when you see this.
O.k then , you said " Just purchased " , how long ago would that be ?
O.k then get ready to pack it up and return it to the store for an exchange or refund , your main board has failed DOA as it were
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before you return it , here is something for you to try but don't count on that too much
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.