Faced the same problem, but but a solution by trying multiple tims
1)If HDMI cable is connected, remove the cable.
2)Switch off the TV, remove the TV power cable and keep pressing the power button for a few seconds.
(This gets rids of all the stray capacitances in the circuit. If you don't know what I'm talking about nevermind. Just do it or go through some theory of Electronics engineering.)
3)Now connect the HDMI cable.
4)And finally connect the power cable and switch on the TV.