Here are some steps you can take to troubleshoot your Smart TV:

1. Check to make sure the power cable is securely plugged in.
2. Check to see if the power button is responding when pressed directly on the TV.
3. If the power button is still not responding, even when pressed directly on the TV, you should check the batteries in your remote.
4. If the power button still remains unresponsive, you may need to perform a soft reset on the TV.
5. If the soft reset doesn’t solve the issue, you may need to perform a hard reset.
6. If after a hard reset the power button remains unresponsive, you should consider contacting the manufacturer for assistance.