Dell XPS 15 (L502X, Early 2011) - Manual (Page 75)

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Using Support Tools
c. If you are experiencing memory issues,
press <y>, otherwise press <n>. The
following message appears:
“Booting
Dell Diagnostic Utility
Partition. Press any key to
continue.”
d. Press any key to go to the Choose An
Option window.
If PSA is not invoked:
Press any key to start Dell Diagnostics from
the diagnostic utility partition on your hard
drive and to go to the Choose An Option
window.
4. Select the test you want to run.
5. If a problem is encountered during a
test, a message with an error code and
a description of the problem appears on
your screen. Write down the error code
and problem description and contact Dell
(see “Contacting Dell” on page 91) for
assistance.
NOTE: The Service Tag for your computer
is displayed at the top of each test screen.
The Service Tag helps you identify your
computer when you contact Dell.
6. When the tests complete, close the test
screen to return to the Choose An Option
window.
7. To exit Dell Diagnostics and restart the
computer, click Exit.