Monitor settings problem

Hi there!
I've experienced a strange problem related to my LG monitor/Mac Mini. Occasionally the monitor becomes "jumpy", the horizontal lines are visible when I scroll over my dock and also on some animated websites. However, if I go to the display menu and set my monitor to another resolution or orientation etc. and set it back to its original settings again the problem disappears. It seems for me like when the monitor runs in a lower refresh rate. But my monitor has only one option to choose (60Hz).
I use two displays and this problem happens only with my main monitor, the second one works perfectly fine.
Does anyone know what is going on?
Thank You for your answers!

Sounds like it could be DVI noise from the way you describe it. What is the size of the LG monitor you have and what resolution is it running at? Is it hooked up by DVI? VGA?
There is a program called SwitchResX that can be used to lower the pixel clock. Sometimes that helps, if it really is DVI noise you are seeing.

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