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does it have power? check for the power led indicator if it lits up. Look for signs on the power cord if it has some exposed wires. If you have a multimeter reader check for continuity problems.
If it turns on reliably but won't stay on, try putting a portable fan pointed at the rear of the set. If this prolongs operation, it may be a semiconductor at fault or an early warning of a common problem caused by chemical (electrolytic) capacitors going bad in the switched mode power supply.If this is the case, the problem will continue to get worse until it no longer turns on at all.
The clicking noise is caused by the relays on the power supply board trying to power up the system. Your TV has detected a problem that's causing the power supply to shutdown. Someone knowledgeable in electronics can track down the problem. The SOURCE of the problem could be another board other the power supply.
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