Compaq Deskpro 4000N Reference Manual page 57

3. Install any optional equipment (PCI expansion board or
memory). Refer to the applicable sections or the
documentation that comes with the optional equipment for
instructions.
4. Replace the computer cover.
5. Turn on the monitor, computer, and any devices you want
to test.
6. Reconfigure the computer, if necessary. Refer to Chapter 5
"Using Compaq Utilities," for instructions.
7. Test the computer (optional) using the TEST utility.
System configuration is the process of specifying the devices
and programs that make up a computer system. When you add
or remove optional equipment, you must reconfigure the
computer to recognize these changes.
Windows NT automatically recognizes all Plug and Play
devices installed. However, if the device is not a Plug and Play
device or is not installed properly, follow the instructions
below:
1. Go to the Control Panel.
2. Select the Add New Hardware icon.
3. Follow the instructions on the screen.
The computer serial number should be provided to Compaq
when requesting information or ordering spare parts. The serial
number is displayed on the system unit cover, right leg,
bottom-front and on the rear of the computer .