Dell Inspiron 1428 (Late 2009) - Manual (Page 32)

32 Memory Module(s)
CAUTION: If the memory module cover is difficult to close, remove the module
and reinstall it. Forcing the cover to close may damage your computer.
4 Align the tabs on the memory module cover with the slots on the
computer base and place the module cover in position.
5 Replace the screw that secures the memory module cover to the computer
base.
6 Replace the battery (see "Replacing the Battery" on page 14).
7 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
Control PanelSystem and SecuritySystem.
1 tab 2 notch
3 memory-module connector
1
2
3