MSI 815 PRO Manual page 27

JGL1 can be connected with an LED. There are two types of LED that you
can use: 3-pin LED or 2-pin LED(ACPI request). When the 2-pin LED is
connected to JGL1, the light will turn green, when system is On. During
sleep mode, the 2-pin LED will change color from Green to Orange. For 3-pin
LED, when LED is connected to JGL1, this will light when the system is On
and blinks when it is in suspend/sleep mode. See page 3-20 (Power status
LED) for further instruction.
1-2 Single Color
1-3 Blink
3-pin LED
Green Color
1 3
Orange
Color
2-23
+
1
3
JGL1
2-pin LED
Green Color
Orange
Color
1
3
1-2 Dual Color