to make sure that the memory modules are firmly seated in their sockets.7. Run the system memory test in the system diagnostics.Installing Memory Modules1. Remove the memory riser cards (see "Removing the Memory Riser Cards").2. Locate the memory module sockets on each memory riser card in which you will install a memory module (see Figure 6-9).3. Press down and outward on the ejectors, as shown in Figure 6-10, to allow the memory module to be inserted into the socket.Figure 6-10. Removing and Replacing Memory Modules4. Align the memory module's edge connector with the alignment key, and insert the memory module in the socket (see Figure 6-10).The memory module socket has an alignment key that allows the memory module to be installed in the socket in only one way.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(see Figure 6-10).When the memory module is properly seated in the socket, the memory module socket ejectors align with the ejectors on the other sockets withmemory modules installed.6. Repeat steps 2 through 5 of this procedure to install the remaining memory modules.7. Perform steps 3 through 7 of the procedure in "Performing a Memory Upgrade."Removing Memory Modules1. Remove the memory riser cards (see "Removing the Memory Riser Cards").2. Locate the memory module sockets on each memory riser card in which you will remove memory modules (see Figure 6-9).3. Press down and outward on the ejectors until the memory module pops out of the socket (see Figure 6-10).Microprocessor TrayThe microprocessor tray must be removed to access the microprocessors and VRMs. The tray must also be removed to gain access to the SCSI backplanes.Use Figure A-4 and Table A-3 to locate the microprocessor board features.Removing the Microprocessor Tray1. Open the bezel (see "Opening the Bezel" in "Troubleshooting Your System").2. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.CAUTION: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see"Safety First—For You and Your System" in "Troubleshooting Your System."NOTICE: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document.CAUTION: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see"Safety First—For You and Your System" in "Troubleshooting Your System."NOTICE: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document.CAUTION: Before you perform this procedure, you must turn off the system and disconnect it from its power source. For more information, see"Safety First—For You and Your System" in "Troubleshooting Your System."NOTICE: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document.