Dell Latitude E5450 Owner's Manual

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3. If the computer is connected to a docking device (docked), undock it.CAUTION: To disconnect a network cable, first unplug the cable from your computer andthen unplug the cable from the network device.4. Disconnect all network cables from the computer.5. Disconnect your computer and all attached devices from their electrical outlets.6. Close the display and turn the computer upside-down on a flat work surface.NOTE: To avoid damaging the system board, you must remove the main battery before youservice the computer.7. Remove the base cover.8. Remove the main battery.9. Turn the computer top-side up.10. Open the display.11. Press and hold the power button for few seconds, to ground the system board.CAUTION: To guard against electrical shock, always unplug your computer from theelectrical outlet before opening the display.CAUTION: Before touching anything inside your computer, ground yourself by touching anunpainted metal surface, such as the metal at the back of the computer. While you work,periodically touch an unpainted metal surface to dissipate static electricity, which couldharm internal components.12. Remove any installed ExpressCards or Smart Cards from the appropriate slots.Recommended ToolsThe procedures in this document may require the following tools:• Small flat-blade screwdriver• #0 Phillips screwdriver• #1 Phillips screwdriver• Small plastic scribeTurning Off Your ComputerCAUTION: To avoid losing data, save and close all open files and exit all open programs beforeyou turn off your computer.1. Shut down the operating system:• In Windows 8.1:– Using a touch-enabled device:a. Swipe in from the right edge of the screen, opening the Charms menu and selectSettings.b. Select the and then select Shut down.4