Dell OptiPlex 755 - Manual (Page 37)

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7 front-panel connector (FRONTPANEL) 18 serial connector (SERIAL2)
8 power connector (POWER) 19 system board speaker (BEEP)
9 external SATA connector (eSATA) 20 aux power LED (aux_LED)
10 internal USB (INT_USB) 21 floppy connector (DSKT)
11 RTC reset jumper (RTCRST) 22 fan connector (FAN_CPU)