My Acer AL1916W has started to go white when I shut down my PC. The same happens when I turn the monitor off (from front, not mains) and it also goes white when powered back on after switching off at the mains (after the Acer sign pops up). It seem to go white every time the screen should go black. Also, I can see when using it now that the graphics are not quite right and seem too light. Is my monitor dying?