Dell Inspiron 2000 System Reference Manual page 63

(the Pad Lock indicator lights up while the embedded numeric keypad is active).
Figure 2. Embedded Numeric Keypad
Some key combinations can be used whether or not the keypad is activated.
NOTE: On an external keyboard, use <Scroll Lock> with the appropriate keys if the
setup program.
Use the numeric keypad combinations in Table 3 to enable and disable several numeric keypad functions.
Table 3. Embedded Numeric Keypad Key Combinations
When Keypad Is On
<Fn><F9>
When Keypad Is Off
<Fn><F9>
Keyboard
Display Key Combinations
NOTE: On an external keyboard, use <Scroll Lock> with the appropriate keys if the
setup program.
Use the key combinations in Table 4 to adjust the computer's display.
Table 4. Display Key Combinations
Key Combinations
<Fn> + down arrow
<Fn> + up arrow
<Fn><F7>
<Fn><F8>
<Fn><F1>
NOTE: Contrast cannot be changed on an active-matrix (thin film transistor [TFT]) display, such as the display in your computer.
Power Conservation Key Combinations
NOTE: On an external keyboard, use <Scroll Lock> with the appropriate keys if the
setup program.
Use the key combinations in Table 5 to activate or turn off the computer's power conservation features.
Table 5. Power Conservation Key Combinations
Key Combinations
<Fn><F1>
<Fn><F3>
Function
Toggles the embedded numeric keypad off
Function
Toggles the embedded numeric keypad on
Function
Incrementally decreases brightness
Incrementally increases brightness
Toggles the computer's display between expanded
video mode and regular video mode
Switches the video image to the next display in the
following sequence: the display, an external monitor, or
both displays simultaneously
Turns off the display
Function
Turns off the display
Displays the battery status icon
External Hot-Key option is enabled in the system
External Hot-Key option is enabled in the system
External Hot-Key option is enabled in the system