Dell Alienware M17x (Mid 2009) - Manual (Page 29)

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CHAPTER 7: MEMORY MODULE(S)
Use your fingertips to carefully spread apart the spring-locks on the memory 5.
module connector until the module pops up.
Remove the memory module.
6.
1
2
4
5
3
1 memory module 4 tab
2 spring locks (2) 5 notch
3 memory module connector
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.
Align the notch on the memory module with the tab on the memory module 1.
connector.
Insert the module into the memory module connector at a 45-degree angle,
2.
and press the module down until it clicks into place. If you do not hear the
click, remove the module and reinstall it.
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.