Won't even turn on

So I wanted to root my phone which is a Lenovo vibe p1 ofc .. so I followed the instructions from the very beginning till the "turn it off and plug the USB and press the volume up button " and then I just wanted to sleep and continue the process tomorrow .. so I unplugged it and tried to start it up it didn't do anything .. just nothing goes on .. idk what to do and I need help very fast