Dell OptiPlex 755 Quick Reference Manual page 49

1 USB connectors
(2)
2 microphone
connector
3 headphone
connector
4 power light
5 power button
6 vents
7 module bay
Use the front USB connectors for devices that you connect
occasionally, such as joysticks or cameras, or for bootable
USB devices (see "System Setup" in the User's Guide for
more information about booting to a USB device).
It is recommended that you use the back USB connectors for
devices that typically remain connected, such as printers and
keyboards.
Use the microphone connector to attach a microphone.
Use the headphone connector to attach headphones and
most kinds of speakers.
The power light illuminates and blinks or remains solid to
indicate different states:
• 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 yellow — See "Power Problems" in the
User's Guide.
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 for Windows XP and
Vista" in the User's Guide.
See "System Lights" on page 65 for a description of light
codes that can help you troubleshoot problems with your
computer.
Press this button to turn on the computer.
NOTICE:
To avoid losing data, do not turn off the
computer by pressing the power button. See "Turning Off
Your Computer" on page 13 for more information
The vents help prevent your computer from overheating. To
ensure proper ventilation, do not block these cooling vents.
Install a D-module optical drive, second hard drive, or floppy
drive in the module bay.
Quick Reference Guide
49