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Hi there and welcome
There can be a few causes, from residue power build up, to settings which I would like to recheck, a connected device and through to a board failure in the TV, so we will go through these to rule this out.
The first step I want you to take please is
Can you please remove the power to the TV (so unplug it from the power socket).
Then on the actual TV, hold the power button for 60 seconds then release.
Then wait 10 minutes, connect 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