Unplug your TV, wait for a few minutes, and then plug it back in. This simple action can often resolve minor technical issues.
Sometimes, the issue might be with your remote and not the TV itself. Try resetting your remote and replacing the batteries.
Make sure that the correct input source is selected. If the wrong source is selected, your TV might appear to be off.
Ensure that your power cable is working properly. A faulty power cable could be the reason why your TV isn't turning on.
Ensure that the wall outlet is providing power to your TV. You can test this by plugging in another device and seeing if it works.
If the backlight of your TV is defective, your TV might appear to be off even when it's on. If this is the case, you might need to get it repaired.