Got my Philips 190CW LCD monitor in 2008. Now from times to times the “brightness” option shows up and changes to ‘0’ without pressing any button on the monitor. The brightness control window is in the middle of the screen and no matter what I do, it keeps coming back. Maybe the brightness is automatically controlled by a “Brightness Sensor”?
One solution is to jammed a bit of paper in the ‘auto’ button to keep it pressed. That allows you to see the whole screen. I use a paper clip to hold the button and it works.