Guide to installing new RAM modules for the Dell Latitude D620.
With the keyboard removed, you should be able to see ram slot A.
Loosen the screw that holds the RAM cover in place.
The screw cannot be fully removed since it is attached to the RAM cover.
If you are increasing the amount of RAM installed -> On first power on after installing the RAM, system on boot up will complain about memory size changed, and to reseat the memory. Wait for about 60 - 90 seconds, and you will receive a few additional messages about F1 to continue or F2 for Setup. Go into Setup and verify that the system sees all memory installed. If installing 2 x 2GB DDR2, max possible, 4GB. BIOS setup should report 4GB installed, of which 3.37GB usable.