BLK 22" Acer LCD 2500 Monitor Why does this monitor shut down when no one is using it ??? The yellow light appears, which means its off and you have to press the power button so its green, for it to come on. The screen saver that always worked, stopped working and now it shuts off every-time. Do I need a driver update ??? How can it be fixed ??? My computer has had Windows 7 Professional all along and never had this problem. Thank You