Dell Inspiron 1440 (Mid 2009) - Manual (Page 4)

4. Disconnect all telephone or network cables from the computer.
5. Press and eject any installed cards from the ExpressCard slot or the 7-in-1 Media Card Reader.
6. Disconnect your computer and all attached devices from their electrical outlets.
7. Remove the battery (see Removing the Battery ).
8. Turn the computer top-side up, open the display, and press the power button to ground the system board.
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CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.