LCD panel flickers and goes black - reduce brightness to fix
One of the LCD displays on my desk recently started flickering on occasion, and this afternoon started going completely blank. In a quick round of testing, I discovered that the graphic card works fine with other displays, and that the problematic display would actually work for a few seconds immediately after power on before the screen turned black.
A quick Google search shows that this is a fairly common problem among LCD panel displays from many manufacturers, and typically involves a problem with the power supply for the LCD backlight. One fix apparently involves replacement of several electrolytic capacitors in the power supply.
In the meantime, reducing the screen contrast and brightness has temporarily fixed the problem. It seems to be somewhat heat-related.