Dell OptiPlex GX520 - Manual (Page 124)

System Board Components
Jumper Settings
1 fan connector (FAN) 11 chassis intrusion switch connector (INTRUDER)
2 processor connector (CPU) 12 password jumper (PSWD)
3 power connector (12VPOWER) 13 battery socket (BATT)
4 memory module connectors (DIMM_1, DIMM_2) 14 PCI connector (SLOT3)
5 serial ATA drive connector (SATA0) 15 PCI riser connector (SLOT2)
6 front-panel connector (FNT_PANEL) 16 serial connector (SER2)
7 CD drive analog audio cable connector for optional analog audio cable (CD_IN) 17 floppy-drive connector (DSKT)
8 power connector (POWER) 18 standby power indicator (AUX_PWR)
9 CD/DVD drive connector (IDE) 19 system board speaker (BEEP)
10 RTC reset jumper (RTCRST) 20 internal speaker (INT_SPKR)
Desktop Computer
Jumper Setting Description
PSWD Password features are enabled (default).
Password features are disabled.