Dell OptiPlex 740 Quick Reference Manual page 16

7 power light
8 hard-drive
activity light
9 headphone
connector
10 microphone
connector
16
Quick Reference Guide
The power light illuminates and blinks or remains solid to
indicate different operating modes:
• No light — The computer is turned off.
• Steady green — The computer is in a normal operating state.
• Blinking green — The computer is in a power-saving mode.
• Blinking or solid amber — See "Power Problems" in your
online User's Guide for instructions.
To exit from a power-saving mode, press the power button or
use the keyboard or the mouse if it is configured as a wake
device in the Windows Device Manager. For more information
about sleep modes and exiting from a power-saving mode, see
"Power Management" in your online User's Guide for more
information.
See "System Lights" on page 54 for a description of light codes
that can help you troubleshoot problems with your computer.
This light flickers when the hard drive is being accessed.
Use the headphone connector to attach headphones and most
kinds of speakers.
Use the microphone connector to attach a microphone.