Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 39

The Smart Cover Lock is a software-controllable cover lock,
controlled by the setup password. This lock prevents
unauthorized access to the internal components. Your computer
ships with the Smart Cover Lock in the unlocked position.
To activate and lock the Smart Cover Lock, complete the
following steps:
1. Turn on the computer.
2. When the F10 Setup message appears in the lower-right
corner of the Compaq logo screen, press the F10 key.
If you do not press the F10 key while the message is
displayed, you must turn the computer off, then on again
to access the utility.
3. Press the Enter key to bypass the welcome screens and
display the main menu.
4. From the main menu, select Computer Setup, and press the
Enter key.
5. Select the Built-In Devices option.
6. Select the Security Management option.
7. Click the Advanced button.
8. Locate the Smart Cover Lock option and select Locked to
enable it, then select OK twice to exit the Advanced screen
and the Security Management screen.
9. For more information about the various screen and
configuration options, refer to Chapter 8, "Using Compaq
Utilities."
10. Select File, Save Changes and Exit from the menu bar near
the top of the screen.