3Slide and hold the battery-bay latch release on the bottom of the computer, and then 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.

1Shut down the computer.

2If the computer is connected to a docking device (docked), undock it. See the documentation that came with your docking device for instructions.

System Information Guide

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Dell D400 manual Installing a Battery, Running the Dell Diagnostics