Dell 690 manual Back View, Back Panel Connectors

		NOTICE: To avoid losing data, do not use the power button
		to turn off the computer. Instead, perform an operating
		system shutdown.
9	power light	The power light illuminates and blinks or remains solid to indicate
		different states:
		¡ No light — The computer is turned off or in a
		hibernation mode.
		¡ Steady green — The computer is in a normal operating
		state.
		¡ Blinking green — The computer is in a power-saving
		state.
		¡ Blinking or solid amber — See Power Problems.
		To exit from a power-saving state, 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 states
		and exiting from a power-saving state, see Power Management.
		See Diagnostic Lights for a description of light codes that can help
		you troubleshoot problems with your computer.
10	microphone	Use the microphone connector to attach a personal computer
	connector	microphone for voice or musical input into a sound or telephony
		program.
11	headphone	Use the headphone connector to attach headphones.
	connector
12	network link light	The network link light is on when a good connection exists between
		a 10-Mbps, 100-Mbps, or 1000-Mbps (or 1-Gbps) network and the
		computer.
13	diagnostic lights	Use these lights to help you troubleshoot a computer problem
	(4)	based on the diagnostic code. For more information, see Diagnostic
		Lights.

Back View

1	power	Insert the power cable. The appearance of this connector may differ from
	connector	what is pictured here.
2	card slots	Access connectors for any installed PCI, PCI-X, or PCI Express cards.
		NOTE: The center five connector slots support full-length cards: one PCI,
		one PCI Express x16, one PCI Express x8 (wired as x4), and two PCI-X
		slots; the connector slots at the top and at the bottom support half-length
		cards: two PCI Express x8 slots (wired as x4).
3	back panel	Plug serial, USB, and other devices into the appropriate connector (see
	connectors	Back Panel Connectors).

Back Panel Connectors