Dell GX280DT - GX280 Desktop Computer User Manual page 206

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Opening the Computer Cover
Dell™ OptiPlex™ GX280 Systems User's Guide
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
1. Follow the procedures in "Before You
2. Remove the computer stand, if it is attached.
3. If you have installed a padlock through the padlock ring on the back panel, remove the padlock.
NOTICE: Ensure that there is sufficient space to support the open cover—at least 30 cm (1 ft) of desk top space.
4. Locate the two release buttons shown in the illustration. Then press the two release buttons as you lift the cover.
NOTICE: Open the cover slowly to ensure that you do not damage any cables.
Raise the back of the cover, and pivot it toward the front of the computer.
1 security cable slot
2 padlock ring
3 release buttons (one on each side)
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Begin."