Dell 1457, 1458 manual - page 6

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2. Turn off your computer (see Turning Off Your Computer) and all attached devices.
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3. Disconnect all telephone or network cables from the computer.
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4. Press and eject any installed cards from the ExpressCard slot or the 8-in--1 Media Card Reader.
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5. Disconnect your computer and all attached devices from their electrical outlets.
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6. Disconnect all attached devices from your computer.
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7. Remove the battery (see Removing the Battery).
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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.
CAUTION: To help prevent damage to the system board, remove the main battery (see Removing the Battery) before working inside the
computer.