Dell OPTIPLEX 990 Service Manual download pdf (Page 10)

Turning Off Your Computer

CAUTION: To avoid losing data, save and close all open files and exit all open

programs before you turn off your computer.

1. Shut down the operating system:

• In Windows 7:

Click Start , then click Shut Down.

• In Windows Vista:

Click Start , then click the arrow in the lower-right corner of the Start

menu as shown below, and then click Shut Down.

• In Windows XP:

Click Start

 Turn Off Computer  Turn Off . The computer turns off

after the operating system shutdown process is complete.

2. Ensure that the computer and all attached devices are turned off. If your

computer and attached devices did not automatically turn off when you

shut down your operating system, press and hold the power button for

about 6 seconds to turn them off.

After Working Inside Your Computer

After you complete any replacement procedure, ensure you connect any

external devices, cards, and cables before turning on your computer.

1. Replace the cover.

CAUTION: To connect a network cable, first plug the cable into the network device

and then plug it into the computer.

2. Connect any telephone or network cables to your computer.

3. Connect your computer and all attached devices to their electrical outlets.

Turn on your computer.

5. Verify that the computer works correctly by running the Dell Diagnostics.

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Dell OPTIPLEX 990 Service Manual Page 10