Dell Precision R5400 (Mid 2008) - Manual (Page 5)

5. Remove the front bezel, if attached (see Removing the Front Bezel ).
6. Remove the computer cover (see Removing the Cover ).
7. When you complete your work inside the computer, replace the computer cover and the front bezel, and reconnect your computer and peripherals to
their electrical outlets.
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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.