I am a new user of Linux. I decided to update my driver because my system (HP Pavilion Dv9646eg) was freezing after wake up on the login window. I followed instructions from the internet. One of which wanted me to type sudo apt-get remove nvidia*. As soon as the Nvidia driver got deleted. My system froze. I turned it off using the power button and now it cannot display anything not even the HP logo that appear when the system powers on. Any help would be appreciated.