HP Compaq d220 MT Reference Manual page 47

4. Open both latches of the memory module socket 1, and insert the memory module into the
socket 2. Begin by installing a module into the socket nearest the preinstalled module, and
install the modules following the numerical order of the sockets.
✎
A memory module can be installed in only one way. Match the notch on the module with the tab
on the memory socket.
5. Push the module down into the socket, ensuring that the module is fully inserted and
properly seated. Make sure the latches are in the closed position 3.
6. Repeat steps 4 and 5 for any additional modules that you want to install.
To reassemble the computer, reverse the removal procedure.
Service Reference Guide, d200
Removal and Replacement Procedures— Microtower Type 2 Chassis
336493-004 6–7