Dell OptiPlex 755 User's Guide - Page 229
Back View, Back Panel Connectors, See Padlock Ring and Security Cable Slot on
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Back View 1 2 34 6 5 1 diagnostic lights 2 computer cover release knob 3 security cable slot 4 back panel connectors 5 power connector 6 vents See "Diagnostic Lights" on page 347 for a description of light codes that can help you troubleshoot problems with your computer. Rotate this knob in a clockwise direction to remove the cover. See "Padlock Ring and Security Cable Slot" on page 274 for information about using the security cable slot. See "Back Panel Connectors" on page 229 for a description of the connectors for your computer. Insert the AC power adapter plug. The vents help prevent your computer from overheating. To ensure proper ventilation, do not block these cooling vents. Back Panel Connectors 1 2 3 4 11 10 9 5 6 8 7 Ultra Small Form Factor Computer 229