Share your experience!
That's rather odd, could you test it in >>> safe mode just to see if it's a third party app causing this.
You should be able to boot in >>> safe mode as the guide <<< or the video ^^^^
perhaps you are not following the steps correctly or you have a faulty power button.
I think that you might be missing a step, describe what you are doing
Do you keep pressing the power button or do you release it?