Eizo CG221 - Manual (Page 32)

(2) Horizontal bars appear on the screen.
=> Use the < Phase > adjustment.
Select the and eliminate the horizontal flickering, blurring or bars by
using the Right and Left switches.
* Horizontal bars may not completely disappear from the screen depending on the
PC.
(3) The screen position is incorrect.
=> Use the adjustment.
The correct displayed position of the monitor is decided because the number and
the position of the pixels are fixed. The adjustment moves the image
to the correct position.
Select and adjust the position by using the Up, Down, Right and Left
switches.
If vertical bars of distortion appear after finishing the adjustment,
return to adjustment and repeat the previously explained adjustment
procedure. ("Clock" => "Phase" => "Position").