have you tried holding the power button down for 15 seconds and then trying to power in?
if that doesn’t work try:
have you tried disconnecting the ac adapter and then holding the + and - button togetther and pressing the power in button. Keep holding the + and - button until you get to the recovery page. Once in recovery hold the power button for 15 seconds and then try switching the console back on.
Last option is to remove the back cover and heat shiled and disconnect and reconnect the battery.