1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.2. Open the system. See "Opening the System" in "Troubleshooting Your System."3. Remove the memory riser card:a. Press in the release tab on the riser card handle. See Figure 6-13.b. Lift up the riser card handle and pull the riser card straight up.c. Remove the plastic riser-card insulator. See "Removing a Memory Riser Card Insulator."4. Add, remove, or replace a memory module, and then replace the insulator. See "Installing Memory Modules" or "Removing Memory Modules."5. Install the memory riser card:a. Ensure that the riser-card handle is fully extended, and then align both edges of the riser card with the front and rear riser-card guides. SeeFigure 6-13.b. Lower the riser card until the riser card connector is near the riser-card connector on the system board.c. Ensure that both connectors are properly aligned, and then gently press the riser card until it is fully seated.d. Press down the riser-card handle until its release tab locks into place.Installing Memory Modules1. If you are installing memory in a hot-pluggable memory operating environment, remove the memory riser card as described in "Removing and Installinga Hot-Pluggable Memory Riser Card."If you are installing memory in a non–hot-pluggable memory operating environment, remove the memory riser card as described in "Removing andInstalling a Non–Hot-Pluggable Memory Riser Card."2. Locate the memory module sockets. See Figure A-3.3. Press the ejectors on the memory module socket down and out, as shown in Figure 6-14, to allow the memory module to be inserted into the socket.Figure 6-14. Installing and Removing a Memory Module4. Align the memory module's edge connector with the alignment key on the memory module socket, and insert the memory module in the socket.5. Press down on the memory module with your thumbs while pulling up on the ejectors with your index fingers to lock the memory module into the socket.When the memory module is properly seated in the socket, the ejectors on the memory module socket align with the ejectors on the other sockets thathave memory modules installed.CAUTION: Many repairs may only be done by a certified service technician. You should only perform troubleshooting and simple repairs asauthorized in your product documentation, or as directed by the online or telephone service and support team. Damage due to servicing that is notauthorized by Dell is not covered by your warranty. Read and follow the safety instructions that came with the product.CAUTION: Many repairs may only be done by a certified service technician. You should only perform troubleshooting and simple repairs asauthorized in your product documentation, or as directed by the online or telephone service and support team. Damage due to servicing that is notauthorized by Dell is not covered by your warranty. Read and follow the safety instructions that came with the product.NOTE: The memory module socket has an alignment key that allows you to install the memory module in the socket in only one way.