Figure 5-6. Inside The Chassis - Dell OptiPlex Gn Reference And Installation Manual

A jumper is referred to as open or unjumpered when the
plug is pushed down over only one pin or if there is no
plug at all. When the plug is pushed down over two pins,
the jumper is referred to as jumpered. In some docu-
ments, the jumper setting may be shown in text as two
numbers, such as 1-2. The number 1 is printed on the
power supply
AC power
receptacle
fan guard
voltage selection switch
parallel port connector
serial port 1 connector
mouse connector
keyboard connector
back of computer

Figure 5-6. Inside the Chassis

DC power cable
drive interface cable
USB connectors
padlock ring
security cable slot
serial port 2 connector
circuit board so that you can identify each pin number
based on the location of pin 1.
Figure 5-7 shows the location and default settings of the
jumper blocks on your system board. See Table 5-1 for
the designations, default settings, and functions of your
system's jumpers.
video connector
NIC connector (optional)
Working Inside Your Computer
drive in upper bay
hard-disk drive
system board
expansion-card cage
5-5