Dell Alienware M18x (Early 2011) - Manual (Page 42)

Replacing the Memory Module(s)
1. Follow the instructions in Before You Begin .
2. Align the notch in the memory module with the tab in the memory-module connector.
3. Slide the memory module 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. If you have replaced memory module(s) in connectors DIMM A and DIMM B, go to step 6 .
5. If you have replaced memory module(s) in connectors DIMM C and DIMM D:
a. Replace the keyboard (see Replacing the Keyboard ).
b. Replace the center control cover (see Replacing the Center Control Cover ).
6. Replace the base cover (see Replacing the Base Cover ).
7. Replace the battery pack (see Replacing the Battery Pack ).
8. Turn on the computer.
If you add more memory to your 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 you need to install memory modules in two connectors, install a memory module in the lower connector before you install a memory module in
the upper connector.
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.