Dell OptiPlex FN389 Quick Reference Manual page 51

Back View
1 diagnostic lights
2 computer cover release
knob
3 back panel connectors
4 power connector
5 vents
1 2
4
5
See "Diagnostic Lights" on page 66 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 "Back Panel Connectors" on page 52 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.
3
Quick Reference Guide
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