Starting The Dell Diagnostics - Dell Latitude D400 Service Manual

Using the Dell Diagnostics:
The ability to display test results
Options to temporarily suspend testing if an error is detected, or to terminate testing
Extensive online Help that describes the tests and devices
Status messages that inform you whether test groups or subtests were completed successfully
Error messages that appear if any problems are detected

Starting the Dell Diagnostics

The Dell Diagnostics is located on a hidden Diagnostic utility partition on your hard drive.
NOTE: If your computer cannot display a screen image, contact Dell. See the User's Guide for
contact information.
1. Shut down the computer.
2. If the computer is connected to a docking device (docked), undock it. See the documentation
that came with your docking device for instructions.
3. Connect 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 <F12>) to begin the Dell Diagnostics. You do not need to highlight
Diagnostics and press <Enter>. The computer automatically runs the Pre-boot System
Assessment.
4. Turn on the computer. When the DELL™ logo appears, press <F12> 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.
5. When the boot device list appears, highlight Diagnostics and press <Enter>.
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 <N>; to continue to the next
test, press <Y>; to retest the component that failed, press <R>.
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. See the User's
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