Monitor is only showing a small part of the full screen

The installation process was successful and you are able to boot, but when logging in you are only able to see a part of the screen (usually the upper right screen corner) with a poor resolution.

This could be because in the BIOS setting not enough RAM was allocated for the screen memory, e.g. 1 MB instead of 8 MB or more. Please check the bios and increase the memory allocated for the screen memory if necessary.