Ubuntu Linux + fix for horizontal lines?

My monitor shows dark horizontal lines on orange - You'd fix it with the 'horizontal' control if it was on your TV - that showed up when I tried to lower the screen resolution. I ended up having to reinstall; but how do I fix the problem - I really want a lower resolution, easier on the eyes. NB... show more My monitor shows dark horizontal lines on orange - You'd fix it with the 'horizontal' control if it was on your TV - that showed up when I tried to lower the screen resolution. I ended up having to reinstall; but how do I fix the problem - I really want a lower resolution, easier on the eyes.

NB More info: My monitor is Xerox XR3-17Gs, now at highest resolution, refresh rate shows as 0hz and can't change it when I go to to Systems, Preferences, Screen Resolution.
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