Dell OptiPlex GX520 - Manual (Page 161)

System Board Components
Jumper Settings
3 power supply and fan 7 power button
4 hard drive 8 front panel door
1 fan connector (FAN) 10 chassis intrusion switch connector (INTRUDER)
2 processor connector (CPU) 11 password jumper (PSWD)
3 power connector (12VPOWER) 12 battery socket (BATT)
4 memory module connectors (DIMM_1 and DIMM_2) 13 PCI connector (SLOT2)
5 serial ATA drive connector (SATA0) 14 serial connector (SER2)
6 front-panel connector (FNT_PANEL) 15 floppy-drive connector (DSKT)
7 power connector (POWER) 16 standby power indicator (AUX_PWR)
8 CD/DVD drive connector (IDE) 17 system board speaker (BEEP)
9 RTC reset jumper (RTCRST) 18 internal speaker (INT_SPKR)
Small Form Factor Computer
Jumper Setting Description
PSWD Password features are enabled.