In the previous summer, many of the times my monitor refused to start on pressing the power button the front panel. It only started at random times (on pressing the power button). And then, after using it for some time, it often displayed the "Luminance" / Contrast box on the screen and subsequently, disabled all the buttons in the front-panel; I couldn't even shut it down without cutting off the power supply. This drama ended after a few days but kept appearing sporadically in the weeks that followed.
The same has occurred again, but the problem's more intense this time. This time, the monitor has managed to automatically reduce the contrast to "0" - it seemed like as if a ghost was operating it.
It's a BenQ FP767-12 17" monitor (bought it in 2005). Any idea on what could be wrong with it and what should I do?