ColorSync Display: Dark Patches on Screen

I have a ColorSync display that has dark patches in the corner of the screen. I have recalibrated the display and have tried turning the display on and off in order to activate the degauss circuitry but the problem remains. Is this a problem with my display.
The dark patches that you see are caused when the electron beam hits part of the aperture grill instead of the phosphor stripe/dot on the display.

A way to correct this is to rotate the screen, through the monitors and sounds control panel, via the geometry settings. Rotating the display slightly to the right of the left will allow you to adjust this anomaly out.
Published Date: Feb 18, 2012