Dell Alienware M11x R2 (Mid 2010) - Manual (Page 31)

2. Align the notch in the memory module with the tab in the memory-module connector.
3. 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.
4. Replace the battery pack (see Replacing the Battery Pack ).
5. Replace the base cover (see Replacing the Base Cover ).
6. Turn on the computer.
As the computer boots, it detects the additional memory and automatically updates the system configuration information.
To confirm the amount of memory installed in the computer:
Click Start ® Control Panel® System and Security® System.
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NOTE: If the memory module is not installed properly, the computer may not boot.
1 memory-module connector 2 tab
3 notch
CAUTION: Before turning on the computer, replace all screws and ensure that no stray screws remain inside the computer. Failure to do so may
result in damage to the computer.