Dell XPS 15 (L521X, Mid 2012) - Manual (Page 25)

Replacing the Memory Module(s)
WARNING: Before working inside your computer, read the safety information
that shipped with your computer and follow the steps in "Before You Begin" on
page 8. After working inside your computer, follow the instructions in
"After Working Inside Your Computer" on page 10. For additional safety best
practices information, see the Regulatory Compliance Homepage at
dell.com/regulatory_compliance.
Procedure
1 Align the notch on the memory module with the tab on the
memory-module connector.
2 Slide the memory module firmly into the connector at a 45-degree angle, and press
the memory module down until it clicks into place. If you do not hear the click,
remove the memory module and reinstall it.
NOTE: If the memory module is not installed properly, the computer may
not boot.
1
2
1 tab 2 notch
Replacing the Memory Module(s) | 25