Phasing test pattern (255,255,255)-(0,0,0)
[hopefully won't flicker due to inversion schemes] [BACK]

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.