Dell 755 manual for more information, No light The computer is turned off

1	5.25-inch drive bay	Can contain an optical drive. Insert a CD or DVD (if supported) into this drive.
2	5.25-inch drive bay	Can contain an optical drive. Insert a CD or DVD (if supported) into this drive.
3	3.5-inch drive bay	Can contain an optional floppy drive or optional media card reader.

4USB 2.0 connectors (2) Use the front USB connectors for devices that you connect occasionally, such as joysticks or cameras, or for bootable USB devices (see your online User’s Guide for more information on 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.
5	LAN indicator light	This light indicates that a LAN (local area network) connection is established.
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 347.
7	power button	Press this button to turn on the computer.
		NOTICE: To avoid losing data, do not turn off the computer by pressing the power
		button. Instead, perform an operating system shutdown. See "Before You Begin" on
		page 21 for more information.
		NOTICE: If your operating system has ACPI enabled, when you press the power
		button the computer will perform an operating system shutdown.
8	power light	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" 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 power-saving mode, see "Advanced Features" on
		page 269.
		See "Diagnostic Lights" on page 347 for a description of light codes that can help you
		troubleshoot problems with your computer.
9	hard drive activity light	This light flickers when the hard drive is being accessed.
10	headphone connector	Use the headphone connector to attach headphones and most kinds of speakers.
11	microphone connector	Use the microphone connector to attach a microphone.

24

Mini Tower Computer