The TV won't power on

My tv was working perfectly fine yesterday and now it won’t turn on at all. I have tried unplugging and replugging it back in, switching to a different outlet, and I made sure the cables are fully connected to the tv. I’ve also tried using the actual power button on the tv and nothing happens. After each time we plug the cable back into an outlet, the white light comes on at the bottom of the tv indicating that the tv has power, but it goes out after about 5 seconds and nothing else happens. What can I do to fix this?