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Hi there and welcome
How are you connecting the Computer to the TV? Via a HDMI cable?
And what message are you getting on the TV?
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