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If you want to go to a CLI (Command Line Interface) you can type Ctrl+Alt+F1. Once there login as root and then try to edit the file /etc/X11/xorg.conf. You can use vim, or other text editor, note that you have to do this as root. If you plan to change something in this file, do a backup of the original.
You have to find the Monitor Section, there you have to review the display size, vert and horiz frequencies. Also check the Section Device. Check which driver you are using
If you're not familiar with VIM (it was a bit confusing at first to me.. had to learn all the silly commands ... ok, so I use it all the time now), there are other text based editors as well, joe, pico, and nano are all good ones. I think nano comes with most distros.
It might be a good idea to have either the manual for your monitor handy when editing the xorg.conf or the specs from the makers (maybe it's on their webpage if you've lost your manual).