Intel LGA775 - Manual (Page 26)

INSTALLATIONS
J15: System Function Connector
J15 provides connectors for system indicators that provide light
indication of the computer activities and switches to change the
computer status.
Hard Disk Drive LED
Not Defined
SMI / Hardware Switch
Reset Switch
ATX Power On Switch
Speaker
Power LED
Speaker: Pins 1 - 4
This connector provides an interface to a speaker for audio
tone generation. An 8-ohm speaker is recommended.
Signal Name
1 Speaker out
2 No connect
3 Ground
4 +5V
Power LED: Pins 11 - 15
The power LED indicates the status of the main power
switch.
Signal Name
11 Power LED
12 No connect
13 Ground
14 No connect
15 Ground
22 2801550 User’s Manual