Welcome to LQ.
It sounds like the issue is just that your xorg.conf file (which controls the video) is not using the correct settings for your equipment. To fix it, you can just edit the file and adjust them as needed. However, in order to do that, we need to know exactly what card and monitor you are using (make/model). Also, can you post the contents of your xorg.conf file (which will be in the /etc/X11 directory)
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