Dell Precision 420 - Manual (Page 100)

Figure 2. Mini Tower Chassis Front Panel
Back Panel
The computer's back panel contains various ports and connectors for attaching external devices and includes a security cable slot. These features
are described in the following subsections.
For information about enabling, disabling, or configuring input/output (I/O) ports and connectors, see " Using System Setup ." For detailed
descriptions and illustrations of each port and connector on the back panel, see " I/O Ports and Connectors ."
Connecting External Devices
You can connect various external devices, such as a mouse and printer, to the I/O ports and connectors on the computer's back panel. The system
BIOS detects the presence of most external devices when you boot or reboot the system. When connecting external devices to the computer,
follow these guidelines:
l Check the documentation that came with the device for specific installation and configuration instructions.
For example, most devices must be connected to a particular I/O port or connector to operate properly. Also, external devices such as a
mouse or printer usually require you to load software files called device drivers into system memory before they will work. These device
drivers help the computer recognize the external device and direct its operation.
l Dell recommends that you attach external devices only while the computer is turned off unless you are instructed otherwise in the
documentation for the particular device. Then turn the computer on before turning on any external devices unless the documentation for the
device specifies otherwise. (If the computer does not seem to recognize the device, try turning on the device before turning on the computer.)
NOTICE: When you disconnect external devices from the back of the computer, wait 10 to 20 seconds after disconnecting the
computer from the electrical outlet before you disconnect the device to avoid possible damage to the system board.
Security Cable Slot and Padlock Ring
On the back of the computer are a security cable slot and padlock ring (see Figure 3 for the desktop chassis or Figure 4 for the mini tower
1 Reset button
2 Power button
3 Power indicator
4 Diskette-drive access indicator
5 Hard-disk drive access
indicator
1 Diskette-drive access indicator
2 Power button
3 Reset button
4 Hard-disk drive access indicator
5 Power indicator
6 Chassis door latch release
button