Originally posted by: corky-g
Yes, agree with PJ, but with a "however." That light stays on as long as you have main power to the motherboard. If, however, you connect your power to a UPS or switched plug box so you can turn main power off - that LED will flicker, fade and go off as well. An ATX board always has power on it as long as you are only using front power switch to turn on and the OS to to turn it off.