Monitor HP 2711x has a horizontal line about 2/3 the way down, completely across the screen about 1 pixel wide. The line looks like a slice trough the current screen image to some kind of image behind the current open windows, but there is no such image behind. Adjusting the screen resolution turns the screen black monentarily which sets the line's color to black when the screen reappears, but then the line changes to again look like a slice through the current window to some kind of false window behind. Rotating the screen image does not rotate the line. Adjusting the screen reolution does not alter the line. Resetting the monitor to factory default does not alter the line. Changing the PC providing input to the screen does not change the line.
Latest HP driver is installed. Monitor's serial number:[Personal Information Removed]. Any suggested fix, please? Thank you.