Dell LATITUDE D400 - Manual (Page 24)

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.
4. Replace the cover.
5. Insert the battery into the battery bay, or connect the AC adapter to your computer and an electrical outlet.
6. 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:
l In the Microsoft® Windows® XP operating system, click the Start button, click Help and Support, and then click Computer Information.
l In Windows 2000, right-click the My Computer icon on your desktop, and then click the General tab.
1 memory module See Mini RSL
2 securing clips (2)
NOTE: If the memory module is not installed properly, the computer may not boot properly. No error message indicates this failure.
NOTICE: If the cover is difficult to close, remove the module and reinstall it. Forcing the cover to close may damage your computer.