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Hi and welcome to JustAnswer,
Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, have you tried unplugging for an extended period of time? ...and then plugging back in into another outlet? ...using the front panel's POWER button not just by the remote?
And as almost always this would be an internal hardware issue, are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?