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Firstly, you should install the appropriate driver for your video card. Usually, the driver comes with some commands which are useful to auto-config the /etc/X11/xorg.conf file. After installing the driver, try to find and use the commands. Secondly, if those commands don't work properly, you must configure the /etc/X11/xorg.conf manually. (For more details, google xorg.conf for your VGA card). Wish you luck !
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