Dell 755 manual About Your Desktop Computer, Your Computer on page 21 for more information

Desktop Computer

About Your Desktop Computer

Front View

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1USB 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 "System Setup" on page 280 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.
2	LAN indicator light	This light indicates that a LAN (local area network) connection is established.
3	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 "Turning Off
		Your Computer" 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.
4	Dell badge	This badge can be rotated to match the orientation of your computer. To rotate,
		place fingers around the outside of the badge, press firmly, and turn the badge. You
		can also rotate the badge using the slot provided near the bottom of the badge.

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Desktop Computer