[chmod]

It's a driver problem open up a terminal by pressing (don't quote me as I cant remember, the exact keys) CTRL+ALT+F2 if you are using an Nvidia card use

Code:

sudo apt-get nvidia-current
*root password*

you will need to connected to the internet and leave this to complete if you cant see which I think you wont leave it for a couple of minutes then hit "y" and enter on your keyboard to accept the download then leave it again for half an hour or so to ensure everything installs then

Code:

sudo reboot
*root password*