Dell OptiPlex 745c (Early 2007) - Manual (Page 20)

3. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
4. Remove the computer cover. See Removing the Computer Cover .
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CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover.
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.