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Can you please remove the power to the TV (so unplug it from the power socket).
Then disconnect all other devices from the TV, all HDMI cables, everything
Then on the actual TV, hold the power button for 60 seconds then release.
Then wait 10 minutes, connect only the power again to the TV, turn it on and tell me please if it is now operating correctly.
Let me know the results please
that will only matter when watching retail DVD's
Try a different HDMI port, let me know if this causes it to turn off please