Asus Motherboard A8N-SLI Premium - Manual (Page 56)

2-30 Chapter 2: Hardware information
• System warning speaker (Orange 4-pin SPEAKER)
This 4-pin connector is for the chassis-mounted system warning
speaker. The speaker allows you to hear system beeps and warnings.
• Power/Soft-off button (Yellow 2-pin PWRSW)
This connector is for the system power button. Pressing the power
button turns the system ON or puts the system in SLEEP or SOFT-OFF
mode depending on the BIOS settings. Pressing the power switch for
more than four seconds while the system is ON turns the system OFF.
• Reset button (Blue 2-pin RESET)
This 2-pin connector is for the chassis-mounted reset button for
system reboot without turning off the system power.