Dell OptiPlex 755 Guide De Référence Rapide page 58

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2
1 cable cover 2 security cable slot
Removing the Cable Cover
1 If a security device is installed in the security cable slot, remove the device.
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1 release button
2 Slide the release button, grasp the cable cover, and slide the cover sideways
as shown until it stops, and then lift the cable cover up and away.
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Quick Reference Guide