Dell OptiPlex 755 User Manual page 223

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
1. Follow the procedures in Before You
2. Remove the computer cover (see
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.
3. If applicable, remove the cable cover, (see
4. Remove the computer cover:
a. Rotate the cover release knob in a clockwise direction, as shown in the illustration.
b. Slide the computer cover forward by 1 cm (½ inch), or until it stops, and then raise the cover.
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 release knob
Inside Your Computer
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION: To avoid electrical shock, always unplug your computer from the AC power adapter before removing the cover.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
Begin.
Removing the Computer Cover).
Cable Cover (Optional)).