Welcome to the Nvidia vs. Linux war!
1- First off purge all Nvidia drivers:
sudo apt-get purge nvidia-*
2- Next, reconfigure your xorg:
- Make a copy and save it in a safe place >this file> /etc/X11/xorg.conf. If things go wrong you might need it later again:
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.BACKUP
The next steps will reconfigure your xorg and install nouveau drivers(intel GPU)
sudo apt-get install nouveau-firmware
sudo dpkg-reconfigure xserver-xorg
Now to get Nvidia on your Linux system you need BumbleBee!