Dell OptiPlex 755 User's Guide - Page 88

5 power light 6 diagnostic lights 7 hard drive activity light 8 headphone connector 9 microphone connector 10 3.5-inch drive bay 11 5.25-inch drive bay The power light illuminates and blinks or remains solid to indicate different operating 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 amber - See "Power Problems" on page 339. 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 Windows Vista" on page 292. See "Diagnostic Lights" on page 347 for a description of light codes that can help you troubleshoot problems with your computer. Use the lights to help you troubleshoot a computer problem based on the diagnostic code. For more information, see "Diagnostic Lights" on page 347. 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. Can contain an optional floppy drive, second hard drive, or optional media card reader. Can contain an optical drive. Insert a CD or DVD (if supported) into this drive. Back View 1 2 3 4 5 6 1 card slots 2 back panel connectors 3 power connector Access connectors for any installed PCI or PCI Express cards, PS/2 connector, eSATA connector, etc. NOTE: The back view of the computer is different if a riser is installed. Plug serial, USB, and other devices into the appropriate connectors (see "Back Panel Connectors" on page 89). Insert the power cable. 88 Desktop Computer