Replace motherboard repair Grub Boot, unable to enter the system from NVIDIA (cursor blinking), may be the graphics card driver is out of the question.
1. Enter BIOS settings and enter the system from integrated graphics
Connect the monitor to the VGI port of the set, and set the display in the BIOS, in general, you can enter the system successfully.
2. Fully written in Nvidia driver (reference)
Execute the following command to cleanly uninstall the Nvidia driver,
sudo apt-get remove--purge nvidia-*sudo apt-get install ubuntu-desktopsudo rm/etc/x11/xorg.confecho ' nouveau ' | sudo tee-a/etc/modules
3. Restart the computer, enter the system, CTRL+ALT+F1 into the TTY, close the LIGHTDM
sudo service LIGHTDM stop
Reinstall the driver, the installation here is 340
Enter the following command to add the drive source
sudo add-apt-repository ppa:xorg-edgers/ppasudo apt-get update
Install version 340 driver
sudo apt-get install nvidia-340
4. (Non-required steps, if you have already been able to enter the desktop without regard to the following steps) Restart the computer, enter the BIOS, disable the Intel Core graphics card, select NVIDIA graphics card boot (reference 1, reference 2)
After entering the system, the resolution may not be correct, execute the following command to view the current driver
Prime-select Query
If you output Intel, execute the following command
sudo update-alternatives--config i386-linux-gnu_gl_conf
Choose the NVIDIA-340-UVM One
sudo update-alternatives--config x86_64-linux-gnu_gl_conf
Also choose NVIDIA-340-UVM that one item
Finally perform the update system
sudo ldconfig-nsudo update-initramfs-u
Select Nvidia Driver
sudo prime-select nvidia
6. Restart, you should be able to use the normal.
Ubuntu 14.04 nvidia graphics driver manual installation and setup