Dell XPS 15 (L502X, Early 2011) - Manual (Page 77)

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Using Support Tools
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.
9. When the tests complete, close the test
screen to return to the Choose An Option
window.
10. To exit Dell Diagnostics and restart the
computer, click Exit.
11. Remove the Drivers and Utilities disc.