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Click "Control Panel."
Click "Appearance and Personalization."
Click "Display Settings."
Move the slider under Resolution. The resolution changes as you move the slider.
I did what you recommended
My display settings showed HIGH RESOLUTION; 1680 X 1050 (recommend).
I moved the the slider to each resolution. The screen size changed but did not move the image up; could not eliminate the black band acrooss the top of the screen.