Dell Latitude D400 Guide D'informations page 23

Slide and hold the battery-bay latch release on the bottom of the computer, and then
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remove the battery from the bay.
Installing a Battery
Slide the battery into the bay until the latch release clicks.
Running the Dell Diagnostics
The Dell Diagnostics is located on a hidden Diagnostic utility partition on your hard drive.
NOTE: If your computer cannot display a screen image, connect an external monitor and press
to switch the video image to the monitor. If the external monitor does not display
a screen image, contact Dell.
Shut down the computer.
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If the computer is connected to a docking device (docked), undock it. See the
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documentation that came with your docking device for instructions.
System Infor m ation Guide
21