Macbook Pro Retina wont turn on

I decided to put Windows 10 on my macbook yesterday and after I installed it everything was fine set all my stuff up and the turned the laptop off for the night. I got up this morning turned it on and the 4 blue windows and the loading circle come on the screen for Win10 and then it blinked once and the screen went black and the computer turns off. I can't even get back into my mac opeteratijg system either, now the screen is frozen with just the four blue windows showing. Any help to rectify this would be great, thanks