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A blinking power light would indicate a problem on the chassis board located inside the tv. Possibly a failed flyback or other electronic component. Its not cost effective to repair when you can invest in new tv for the same cost as repairing the defective tv. I should also mentioned the danger of dyi troubleshooting of the components inside the tv. I do not recommend unless you are familiar with properly discharging the tube to avoid electrical shock.
The green light indicates that it is getting power from the outlet ok.
The clicking is the power relay trying to turn it on but there is an
internal fault forcing it to shutdown. You either have a power supply
problem, horizontal output transistor (HOT) is shorted or a bad flyback
transformer. In any case it can most likely be repaired by a qualified
technitian. If it is the flyback it may be expensive.
This could cause a problem, because modern TVs and most other entertainment electronic goods, have a small kind of computer chip, but there should be a Reset button probably inside the set!
If you feel confident about computer chips you may be able to find the button by tracing the circuit.(Disconnected from the mains).
Another idea is if there is a small button cell or battery inside, then try disconnecting it for a day.