Dell Precision 420 - Manual (Page 16)

System Board Jumpers
Figure 23 shows the location of the jumpers on the system board. Table 1 lists the system board jumpers and their settings.
Figure 23. System Board Jumpers
Jumpers are small blocks on a circuit board with two or more pins emerging from them. Plastic plugs containing a wire fit down over the pins. The
wire connects the pins and creates a circuit.
NOTICE: Make sure your system is turned off before you change a jumper setting. Otherwise, damage to your system or
unpredictable results may occur.
To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated.
Table 1. System Board Jumper Settings
22 Auxiliary hard-disk drive access LED connector
23 PCI expansion slots
24 AGP graphics slot
25 Remote wakeup on LAN connector
26 Primary processor 0 socket
27 Network cable connector
28 Diagnostic LEDs
29 USB connectors
30 Secondary processor 1 socket
31 Line-in connector
32 Line-out connector
33 Microphone Connector
34 Mouse/keyboard (stacked)
35 System fan power connector
36 Serial port 1/ serial port 2 (stacked)
37 Parallel port/external SCSI port (stacked)
Jumper Setting Description
PSWD (default) Password features are enabled.
Password features are disabled.
RTCRST Real-time clock reset. Can be used for troubleshooting purposes.
jumpered unjumpered