Do this in the dark so you can see the screen when it’s on and off. When it’s on, but you see nothing, you may see a slight blue hue on the screen.
So hold the power button – like 30 seconds. Keep holding, and you will see the screen turn BLACK. When and if you see the screen turn black …it is a good thing – you know the unit turned off – and you can RELEASE the power button. Now, press the power button again, holding it until the unit powers on. OK?