Dell Inspiron 1721 (Mid 2007) - Manual (Page 147)

Adding and Replacing Parts
147
Your computer has two user-accessible SODIMM sockets, one accessed from
beneath the keyboard (DIMM A), and the other accessed from the bottom of
the computer (DIMM B).
NOTICE:
If your computer has only one memory module, install the memory module
in the connector labeled “DIMMA.”
NOTICE:
If you need to install memory modules in two connectors, install a
memory module in the connector labeled “DIMMA” before you install a module in
the connector labeled “DIMMB.”
Removing the DIMM A Memory Module
NOTICE:
To avoid electrostatic discharge, ground yourself by using a wrist grounding
strap or by periodically touching an unpainted metal surface (such as a connector
on the back of the computer).
The DIMM A memory module is located under the keyboard.
1 Follow the procedures in "Before You Begin" on page 135.
2 Remove the hinge cover (see "Hinge Cover" on page 142).
3 Remove the keyboard (see "Keyboard" on page 144).
NOTICE:
To prevent damage to the memory module connector, do not use tools to
spread the memory module securing clips.
4 Use your fingertips to carefully spread apart the securing clips on each end
of the memory module connector until the module pops up.
5 Remove the module from the connector.