First International Computer AN11, Manual

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Installation Procedures
Front Panel Block, Power LED and Speaker Connector
This block connector includes the connectors for linking with HDD LED,
power LED (2 and 3 pins), dual power LED, power button, suspend button,
reset button, and IR on the front panel of the system case. Please identify
polarities of plug wires for the case speaker and LEDs. Please ask vendor
about this information when you buy them and install the system by yourself.
The plug wires polarities of these buttons will not affect the function.
CD Audio-In Connectors
The CD_IN2 connector is used as a port for CD drive audio input. The AUX_IN1
privided users with one extra CD drive audio input port. Both connectors are
of 2.0 mm; however, if 2.54 mm connector is interested, please ask your
mainboard supplier for details.