Dell PP521 Optional optical-drive, Bay FlexBay drive, Power button, Power light, Operating state

3	optional optical-drive	Supports an optical drive.
	bay
4	FlexBay drive	Supports a floppy drive, a Media Card Reader, or an
		additional hard drive.
5	front I/O connectors	Plug USB and other devices into the appropriate
		connectors (see "Front-Panel Connectors" on page 20).
6	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.

NOTICE: If your operating system has ACPI enabled, when you press the power button the computer will perform an operating system shutdown.

NOTE: The power button can also be used to wake the system or to place it into a power-saving state (see "Power Management" on page 38 for more information).

7front-panel LEDs (4) Multi-colored lights provide illumination for the front of the computer.

8	power light	The power light illuminates or remains solid to
		indicate different states:
		• No light — The computer is turned off.
		• White light— The computer is in a normal
		operating state.
		• Blinking white light— The computer is in a
		power-saving state.
		To exit from a power-saving state, press the power
		button or use the keyboard or mouse if it is configured
		as a wake device in the Windows Device Manager. For
		more information about sleep states and exiting from a
		power-saving state, see "Power Management" on
		page 38.
9	FlexBay drive eject	Press here to open or close the floppy/media card
	button	reader panel.
10	optical drive panel	Press here to open/close the optical drive.
	eject button (2)

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