Dell Alienware M15x (Early 2011) - Manual (Page 23)

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CHAPTER 5: MEMORY MODULE(S)
1
2
3
4
3
1
2
1 memory module 3 tab
2 memory-module connector 4 notch
CAUTION: If the memory-module door is difficult to close, remove the
memory module and reinstall it. Forcing the memory-module door to
close may damage your computer.
NOTE: If the memory module is not installed properly, the computer may
not boot.
Replacing the Memory Module(s)
CAUTION: If you need to install memory modules in two connectors,
install a memory module in the lower connector before you install a
module in the upper connector.
Follow the instructions in “Before You Begin” on page 1. 6.
Align the notch on the memory module with the tab on the memory-module 2.
connector.
Insert the module into the memory-module connector at a 45-degree angle, 3.
and press the memory module down until it clicks into place. If you do not
hear the click, remove the module and reinstall it.