Dell D400 manual Connect the computer to an electrical outlet

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3Connect the computer to an electrical outlet.

NOTE: If you do not see anything on your display, hold down the mute button and press the

power button (instead of ) to begin the Dell Diagnostics. You do not need to highlight

Diagnostics and press . The computer automatically runs the Pre-boot System Assessment.

4Turn on the computer. When the DELL™ logo appears, press immediately. If you wait too long and the Microsoft® Windows® logo appears, continue to wait until you see the Windows desktop. Then shut down your computer and try again.

5When the boot device list appears, highlight Diagnostics and press .

The computer begins to run the Pre-boot System Assessment, a series of embedded diagnostics that perform initial testing on your system board, keyboard, hard drive, and display.

•During the assessment, answer any questions that appear.

•If a component failure is detected, the computer stops and beeps. To stop the

assessment and reboot to the operating system, press ; to continue to the

next test, press ; to retest the component that failed, press .

•If failures are detected during the Pre-boot System Assessment, write down the error code(s) and contact Dell before continuing on to the Dell Diagnostics.

•If you receive a message stating that no Diagnostics utility partition has been found, follow the instructions on the screen to run the Dell Diagnostics from your Drivers and Utilities CD.

If the Pre-boot System Assessment completes successfully, you receive the message

Booting Dell Diagnostic Utility Partition. Press any key to continue.

6Press any key to start the Dell Diagnostics from the Diagnostics utility partition on your hard drive.

7After the Dell Diagnostics loads and the Main Menu screen appears, click the button for the option you want.

NOTE: The Service Tag for your computer is located in the title bar of each screen.

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System Information Guide