Dell OptiPlex 755 - Manual (Page 212)

system setup and is active.
Start the Dell Diagnostics from either your hard drive or from the Drivers and Utilities media (an optional CD). See Starting the Dell Diagnostics From Your Hard
Drive or Starting the Dell Diagnostics From the Drivers and Utilities CD (Optional) for more information.
Starting the Dell Diagnostics From Your Hard Drive
1. Ensure that the computer is connected to an electrical outlet that is known to be working properly.
2. Turn on (or restart) your computer.
3. When the DELL logo appears, press <F12> immediately.
If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft Windows desktop, and then shut down your
computer and try again.
4. Use the up- and down-arrow keys to select Diagnostics from the boot menu and then press <Enter>.
The computer runs the Pre-boot System Assessment (PSA), a series of initial tests of your system board, keyboard, display, memory, hard drive, and so
on.
l Answer any questions that appear.
l If failures are detected, write down the error code(s) and see Contacting Dell .
l If the Pre-boot System Assessment completes successfully, the following message appears: "Booting Dell Diagnostic Utility Partition.
Press any key to continue ."
5. Press any key to start the Dell Diagnostics from the diagnostics utility partition on your hard drive.
6. Press <Tab> to select Test System and then press <Enter>.
7. At the Dell Diagnostics Main Menu, left-click with the mouse, or press <Tab> and then <Enter>, to select the test you want to run (see Dell Diagnostics
Main Menu ).
8. After all tests have completed, close the test window to return to the Dell Diagnostics Main Menu.
9. Close the Main Menu window to exit the Dell Diagnostics and restart the computer.
Starting the Dell Diagnostics From the Drivers and Utilities CD (Optional)
1. Insert the Drivers and Utilities CD (optional).
2. Shut down and restart the computer.
When the DELL logo appears, press <F12> immediately.
If you wait too long and the Windows logo appears, continue to wait until you see the Windows desktop. Then shut down your computer and try again.
3. When the boot device list appears, highlight SATA CD-ROM Device and press <Enter>.
4. Select the SATA CD-ROM Device option from the CD boot menu.
NOTE: If your computer does not display a screen image, contact Dell (see Contacting Dell ).
NOTE: Keyboard failure may result when a key is held down for extended periods of time. To avoid possible keyboard failure, press and release
<F12> in even intervals to open the Boot Device Menu.
NOTE: If you see a message stating that no diagnostics utility partition has been found, run the Dell Diagnostics from your Drivers and Utilities
media (see Starting the Dell Diagnostics From the Drivers and Utilities CD (Optional) ).
NOTE: It is recommended that you select Test System to run a complete test on your computer. Selecting Test Memory initiates the extended
memory test, which can take up to thirty minutes or more to complete. When the test completes, record the test results and then press any key to
return to the previous menu.
NOTE: Write down any error codes and problem descriptions exactly as they appear and follow the instructions on the screen.
NOTE: The next steps change the boot sequence for one time only. On the next start-up, the computer boots according to the devices specified in
system setup.