Dell OptiPlex 740 User Manual page 22

NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
2. Disconnect any telephone or telecommunication lines from the computer.
3. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
4. If applicable, remove the computer stand (for instructions, see the documentation that came with the stand).
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover.
5. Remove the computer cover:
Remove the mini tower computer cover (see
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Remove the desktop computer cover (see
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Remove the small form factor computer cover (see
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NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
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Removing the Computer Cover).
Removing the Computer Cover).
Removing the Computer Cover).