I have installed the Ubuntu 13.04 amd64-version on a brand new computer. I have bought a similar computer for my father a few weeks ago with the only difference being the graphic card and the power supply. His didn't have any problems after installation, so I suspect it is the driver for the graphic card. Here is a screenshot of how it looks like:
So this is much more than just adjusting the alignment with a button on the monitor. What has been installed is the 64-bit version of Ubuntu (the same as my father's installation). But here the graphic card is a "HIS Radeon HD 6570 Silence". During the setup, I selected the 3rd-party software and to automatically download updates during installation. Now I can't get past the login screen, but can get to a command prompt by using the CTRL+Alt+F2. Does anyone have an idea of how to fix this?