Dell 745 manual Desktop Computer Back View, No light The computer is turned off

5	power light		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 your online 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
			your online User’s Guide.
			See "System Lights" on page 49 for a description of light codes that can help you
			troubleshoot problems with your computer.
6	diagnostic lights		Use the lights to help you troubleshoot a computer problem based on the
			diagnostic code. For more information, see "Diagnostic Lights" on page 50.
7	hard-drive activity light		This light flickers when the hard drive is being accessed.
8	headphone connector		Use the headphone connector to attach headphones and most kinds of speakers.
9	microphone connector		Use the microphone connector to attach a microphone.
10	3.5-inch drive bay		Can contain an optional floppy drive or optional Media Card Reader.
11	5.25-inch drive bay		Can contain an optical drive. Insert a CD or DVD (if supported) into this drive.
Desktop Computer — Back View
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