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samsung Q70t bought 2 months ago

Love the experience   of this tv but last night  the whole screen went dark  bluish  without sound. Called samsung and had advised  me to unplug the hdmi cable which  is the only thing connected in the back of the tv to the cable box.  That worked  good for about half an hour but now it has gone back to  dark blueish  now with sound without  the hdmi cable connected  since they dermed the cable defective.  Any advice helps. Thanks !