•System Warning Speaker Lead (4-pin SPKR)

This 4-pin connector connects to the case-mounted speaker and allows you to hear system beeps and warnings.

•System Management Interrupt Lead (2-pin SMI)

This 2-pin connector allows you to manually place the system into a suspend mode, or “green” mode, where system activity is instantly decreased to save power and to expand the life of certain system components. Attach the case-mounted suspend switch to this 2-pin connector.

•ATX Power Switch / Soft-Off Switch Lead (2-pin PWRBTN)

This connector connects a switch that controls the system power. Pressing the power switch turns the system between ON and SLEEP, or ON and SOFT OFF, depending on the BIOS or OS settings. Pressing the power switch while in the ON mode for more than 4 seconds turns the system OFF.

•Reset Switch Lead (2-pin RESET)

This 2-pin connector connects to the case-mounted reset switch for rebooting the system without turning off the system power.

•Hard disk activity LED (2-pin IDE_LED)

This connector supplies power to the hard disk activity LED. Any read or write activity of an IDE device cause this LED to light up.

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Chapter 2: Hardware information