Dell OptiPlex 755 Quick Reference Guide - Page 18
Quick Reference Guide - lights 3 and 4
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8 power light 9 hard drive activity light 10 headphone connector 11 microphone connector 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 - The computer is receiving electrical power, but an internal power problem may exist (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 pwoer-saving mode, see "Advanced Features' in the User's Guide. See "Diagnostic Lights" on page 66 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. 18 Quick Reference Guide