Dell XPS 15 (L501X, Late 2010) - Manual (Page 73)

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