Dell WHL, U7021 manual One x16 slot and one x1 slot

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5	DVI video connector	If your monitor has a DVI connector, plug it into the DVI connector on the computer. If
		your monitor has a VGA connector, plug it into the VGA connector on the computer.
6	VGA video connector	If your monitor has a DVI connector, plug it into the DVI connector on the computer. If
		your monitor has a VGA connector, plug it into the VGA connector on the computer.
7	security cable slot	Use a security cable with the slot to help secure your computer.

8sound card connectors • Line-in connector — Use the blue line-in connector to attach a record/playback device such as a cassette player, CD player, or VCR.

•Microphone connector — Use the pink microphone connector to attach a personal computer microphone for voice or musical input into a sound or telephony program.

•Line-out connector — Use the green line-out connector to attach headphones and most speakers with integrated amplifiers.

•Surround connector — Use the black surround connector to attach multichannel- capable speakers.

•Center/Low-Frequency Effects (LFE) connector — Use the yellow center/LFE connector to attach your subwoofer.

9	padlock ring	Insert a padlock to lock the computer cover.
10	optional modem	If you have a modem, connect a telephone cable to the modem connector (optional).
	connector	NOTE: For optimum performance, install a modem card only in PCI slot 2, 3, or 4.
		NOTE: Do not plug a telephone cable into the network connector.
11	power connector	Insert the power cable.
12	serial connector (COM 1)	Connect a serial device, such as a handheld device, to the serial port.
13	parallel connector	Connect a parallel device, such as a printer, to the parallel connector. If you have a USB
		printer, plug it into a USB connector.
14	diagnostic lights (4)	Use the lights to help you troubleshoot a computer problem based on the diagnostic
		code. For more information, see "Diagnostics Lights" on page 53.
15	keyboard connector	If you have a standard keyboard, plug it into the purple keyboard connector. If you have a
		USB keyboard, plug it into a USB connector.
16	mouse connector	Plug a standard mouse into the green mouse connector. Turn off the computer and any
		attached devices before you connect a mouse to the computer. If you have a USB mouse,
		plug it into a USB connector.

17USB 2.0 connectors (6) Use the back USB connectors for devices that typically remain connected, such as printers and keyboards.

		It is recommended that you use the front USB connectors for devices that you connect
		occasionally, such as joysticks or cameras.
18	card slots	Access connectors for any installed PCI cards (four slots) and PCI Express cards
		(one x16 slot and one x1 slot).
19	power supply fans	For optimal cooling, two power supply fans are provided. Do not block the vents.

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Removing and Installing Parts