NOTE: If the memory module is not installed properly, the computer may not boot. No error message indicates this failure.
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NOTICE: If the cover is difficult to close, remove the module and reinstall it. Forcing the cover to close may damage your computer.
3.Replace the module cover.
4.Insert the battery into the battery bay, or connect the AC adapter to your computer and an electrical outlet.
5.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 
→ Help and Support→ Dell System Information.