Dell LATITUDE D400 - Manual (Page 41)

NOTICE: To prevent damage to the memory module connector, do not use tools to spread the memory-module
securing clips.
2. If you are replacing a memory module, remove the existing module:
a. Use your fingertips to carefully spread apart the securing clips on each end of the memory module connector
until the module pops up.
b. Remove the module from the connector.
1 memory module
2 securing clips (2)
3. Ground yourself and install the new memory module:
a. Align the notch in the module edge connector with the tab in the connector slot.
b. Slide the module firmly into the slot at a 45-degree angle, and rotate the module down until it clicks into place.
If you do not feel the click, remove the module and reinstall it.