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Image should show a steady and bright (one-pixel scale) checkerboard pattern. On LCD monitors connected via analog connection, use monitor's auto-adjust or manual clock/pitch and phase controls, if necessary, to eliminate broad vertical banding (clock/pitch), and shimmering horizontal streaking (phase). For a more detailed, and illustrated explanation, see my Clock/Pitch and Phase controls page. If no clock/phase combinations are very satisfactory, try selecting a different refresh rate (e.g. 60/70/72/75Hz) on your PC.