To sort this problem out you need to install/reinstall video driver for your card

Check you video driver

sudo lshw -c video |grep configuration

lspci -vnn | grep -i VGA -A 12

Output should contain driver that currently installed

The xorg-edgers ppa provides the very latest nvidia drivers. Run the following commands to set it up.

sudo add-apt-repository ppa:xorg-edgers/ppa -y
sudo apt-get update

Nvidia case

Either you can install the driver directly by installing a single package containing "nvidia" and the major version number ( 173, 304, 310, 313, 319, 331, 334 or 337).

# 331 driver
sudo apt-get install nvidia-331

# 334 driver
sudo apt-get install nvidia-334

# install the latest version
sudo apt-get install nvidia-current

Manually install Video Driver

Download the propietary driver from here

Amd
http://support.amd.com/us/gpudownload/Pages/index.aspx
Nvidia
http://www.nvidia.com/Download/index.aspx?lang=en-us

Switch to root

sudo su

Install your driver

sh 'path/to/your/file.run'

When the installatuion is complete type

aticonfig –initial -f

If later on you want to uninstall type this

sh aticonfig –uninstall

Removing the drivers

In case something wrong you may remove this driver

Reboot to recovery

# remount root file system as writable
mount -o remount,rw /

# remove all nvidia packages
apt-get purge nvidia*

Restart your machine

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