Dell Inspiron 1420 (Mid 2007) - Manual (Page 94)

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Troubleshooting
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 Start the Dell Diagnostics in one of the following two ways:
a When the DELL™ logo appears, press <F12> immediately. Select
Diagnostics from the boot menu, and then press <Enter>.
NOTE:
If you wait too long and the operating system logo appears, continue
to wait until you see the Microsoft
®
Windows
®
desktop, then shut down your
computer and try again.
NOTE:
Before attempting option B, the computer must be powered down
completely.
b Press and hold the <Fn> key while powering the computer on.
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.
The computer runs the Pre-boot System Assessment, a series of initial
tests of your system board, keyboard, hard drive, and display.
• During the assessment, answer any questions that appear.
• If a failure is detected, the computer stops and beeps. To stop the
assessment and restart the computer, 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.
If the Pre-boot System Assessment completes successfully, you receive the
message
Booting Dell Diagnostic Utility Partition.
Press any key to continue .
4 Press any key to start the Dell Diagnostics from the diagnostics utility
partition on your hard drive.
Starting the Dell Diagnostics From the Drivers and Utilities Media
1 Insert your Drivers and Utilities media.
2 Shut down and restart the computer.
3 When the DELL logo appears, press <F12> immediately.