Dell T8144 manual Computer. Instead, perform an operating system shutdown

8	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 43.
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	power button,	Press the power button to turn on the computer. The light in the center
	power light	of this button indicates power state. See "Specifications" on page 99 for
		more information.
		NOTICE: To avoid losing data, do not use the power button to turn off the
		computer. Instead, perform an operating system shutdown.
11	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 105 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.
12	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 computer is adequately ventilated. Use only a dry cloth to clean the vent area to avoid water damage to the computer.

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Removing and Installing Parts