Lenovo G50-80 wont start properly

My Lenovo G50-80 wont start properly because i have to forced shut down it 2 times so now when i open turn it on it will only show the Lenovo Logo for about maybe 30-45 mins and then it will show a loading circle on the bottom of the logo and a "Preparing Automatic Repair" for about 30-60 mins and then it will only show a black screen.