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First, try leaving the TV unplugged for 10 minutes.
Then try plugging it in and turning it on again after 10 minutes is up.
If it still won't work then it has an internal fault, likely caused by a power surge during the frequent power interruptions yesterday.
If it still won't turn on after leaving it unplugged for 10 minutes then the power supply board has likely been damaged.
This can be repaired for around £100-150.