Laptop won't start after windows updating

Hello, I was trying to update windows 10 today in my Toshiba laptop. After it finished 75 percent update it automatically restarted and never came back the screen. Now it is completely black screen. But seems like the laptop is running still because I can hear the fan noise. I even can't enter into the bios. Somebody please help me. I was in the middle of writing my article which is due so soon. Please help me.