After you changed the resolution the monitor did not change to the new resolution, I have dell at work then is not very good as sensing the resolution on the VGA input. Often you can correct this, after you set the resolution on the video card and the monitor is messed up, try powering the monitor off then back on.
If you use a DVI cable the monitor is not going to have guess the resolution so it should work much better.
Question what did you have to do to get the vido card to show the 1920 X 1080 resolution?
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