try putting away your voltage regulator if you are using one, but make sure that your pc and monitor have the same voltage with the current in your place. I don't want you to burn up your computer. That's the reason why i don't use avr's because sometimes it makes my monitor picture vibrate.
I solved the problem of screen vibrating on Acer S231HL LCD monitor used with my dad's new Mac Mini by going to System Preferences > Hardware > Displays and then changing the resolution from 1080i to 1080p. Voila, the shaking went away!
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