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Hello, Sorry you're having problems. Please get me the full model number off of the back of the set. Also this generally indicates a hardware failure with the TV, either the power supply board or mainboard failing is the most common cause of this.
However it's worth it to try a hard reset, as sometimes the processor in the TV can simply have locked up.
The first thing you would try, is disconnect the set from power, then press and hold the power button on the TV itself (not the remote), for 10 seconds and release. Then plug the set back in, and also check that the power cord is connected tight at the TV as well. Press power once, and see if the set powers up normally. Try this procedure up to 3 times, and please let me know what happens.