SOYO SY-7ISA plus Owner's Manual page 33

Hardware Installation SY-7ISA+
5. IDE LED
Attach the 2-pin IDE device LED cable to the corresponding IDE LED
header on the Motherboard. This will cause the LED to lighten when an
IDE (HDD, CD-ROM) device is active.
HDD LED Pin Assignment
_
+
LED Anode LED Cathode
6. ATX Power On/Off Switch
Attach the 2-pin momentary type switch to the PWRBT header for turning
On or Off your ATX power supply.
PWRBT Pin Assignment
1
Power On/Off GND
29