Dell OptiPlex 755 Quick Reference Guide - 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 powersaving 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