Dell Inspiron 3800 System Reference Manual page 121

Power Conservation: Dell Inspiron 3800 System Reference
Table 1 identifies the power management key combinations.
NOTE: To use key combinations on an external keyboard, enable the
External Hot Key option in the System Setup program, and press <Scroll
Lock> instead of <Fn>.
Table 1. Key Combinations to Activate/Deactivate Features
Feature
Turn off display
Turn off hard-disk drive
Standby mode
Sleep mode (ACPI-
compliant systems)
Standby mode
(Microsoft® Windows® 98
systems)
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Activate/Deactivate
To activate, press <Fn><d>.*
To deactivate, move the cursor or press a key on the
integrated or external keyboard. (If nothing happens, the
computer may be in standby mode. Press the power button to
resume normal operation.)
To activate, press <Fn><h>.*
Automatically deactivates when the hard-disk drive is
accessed.
NOTE: If a modular hard-disk drive is installed in the media
bay, you cannot turn off the hard-disk drive by pressing
<Fn><h>.
To activate, press <Fn><Esc>.
To deactivate, press the power button.