Dell OptiPlex 755 User's Guide - Page 318
If applicable, remove the cable cover see Cable Cover Optional
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1 Follow the procedures in "Before You Begin" on page 21. NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components. 2 If applicable, remove the cable cover (see "Cable Cover (Optional)" on page 237). 3 Replace the computer cover: a Tilting the cover slightly, align it with the retaining strip at the back of the system. b Slide the computer cover backward until it snaps into place. CAUTION: Graphics card heat sinks can become very hot during normal operation. Ensure that a graphics card heat sink has had sufficient time to cool before you touch it. 1 1 release knob 318 Replacing the Computer Cover