Dell Inspiron 1521 (Mid 2007) - Manual (Page 155)

Adding and Replacing Parts
155
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 memory 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.
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