Dell DCTA, 9150 manual System shutdown

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5	IEEE 1394 connector	Use the optional IEEE 1394 connector for high-speed data
	(optional)	devices such as digital video cameras and external storage
		devices.
6	vents	For adequate cooling, do not block any of the vents.
		NOTICE: Ensure that there is a minimum of two inches of
		space between all vents and any object near these vents.
		NOTICE: Keep the vent area clean and dust-free to ensure
		that the system is adequately ventilated. Use only a dry
		cloth to clean the vent area to avoid water damage to the
		system.
7	USB 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 Options" on page 116 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.
8	power button	Press to turn on the computer.
		NOTICE: To avoid losing data, do not use the power button
		to turn off the computer. Instead, perform an operating
		system shutdown.
9	hard-drive activity light	The hard drive activity light is on when the computer reads
		data from or writes data to the hard drive. The light might also
		be on when a device such as a CD player is operating.
10	diagnostic lights (4)	Use the lights to help you troubleshoot a computer problem
		based on the diagnostic code. For more information, see
		"Diagnostic Lights" on page 53.
11	headphone connector	Use the headphone connector to attach headphones and most
		kinds of speakers.
12	microphone connector	Use the microphone connector to attach a personal computer
		microphone for voice or musical input into a sound or
		telephony program.
13	Service Tag	Used to identify your computer when you access the Dell
		Support website or call technical support.

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Removing and Installing Parts