Dell Latitude D820 Memory Chip (RAM) Replacement

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Shut down your computer. Disconnect all power sources before opening the computer cover or panels.
Remove the battery, hinge cover, and keyboard from the computer.

Ground yourself by touching one of the metal connectors on the back of the computer.
If you leave the area, ground yourself again when you return to the computer.

To prevent damage to the memory module connector, do not use tools to spread the memory-module securing clips.
Use your fingertips to carefully spread apart the securing clips on each end of the memory module connector until the module pops up.
Remove the module from the connector.

Insert memory modules at a 45-degree angle to avoid damaging the connector. If the memory module is not installed properly, the computer may not boot properly. No error message indicates this failure.
Ground yourself and install the new memory module by aligning the notch in the module edge connector with the tab in the connector slot.
Slide the module firmly into the slot, and rotate the module down until it clicks into place. If you do not feel the click, remove the module and reinstall it.

If you're willing to replace or install the memory module/chip in the DIMM B connector, only insert or replace the keyboard and hinge cover.
Insert or replace the keyboard, hinge cover, and battery on the computer respectively.
After turning on your computer, it should detect the amount of RAM installed, if RAM is installed correctly.

If you haven't done so, shut down your computer. Disconnect all power sources before opening the computer cover or panels. Remove the battery afterward.
Turn the computer upside-down, loosen the captive screw on the memory module cover (see image), and remove the cover.

To prevent damage to the memory module connector, do not use tools to spread the memory-module securing clips.
If you are replacing a memory module, remove the existing module by using your fingertips to carefully spread apart the securing clips on each end of the memory module connector until the module pops up.
Remove the module from the connector.

Insert memory modules at a 45-degree angle to avoid damaging the connector. If the memory module is not installed properly, the computer may not boot properly. No error message indicates this failure.
For optimal performance, identical memory modules should be used in each connector.
Ground yourself and install the new memory module by aligning the notch in the module edge connector with the tab in the connector slot.
Slide the module firmly into the slot, and rotate the module down until it clicks into place. If you do not feel the click, remove the module and reinstall it.

Replace the memory module cover.
If the cover is difficult to close, remove the module and reinstall it. Forcing the cover to close may damage your computer.

Insert the battery into the battery bay, or connect the AC adapter (charger) to your computer and an electrical outlet.
Turn on the computer.
After turning on your computer, it should detect the amount of RAM installed, if RAM is installed correctly.