6. Position the memory module over the memory slot. Make sure that the notch1 on the memory module aligns correctly with the slot key 2 on the systemboard. Push the memory module straight down into the slot until the retainingclips close.What to do next:v To work with another option, go to the appropriate section.v To complete the installation, go to “Completing the parts replacement” onpage 37.Installing or replacing a PCI cardAttentionDo not open your computer or attempt any repair before reading and understanding the“Important safety information” in the ThinkCentre Safety and Warranty Guide that came withyour computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to:http://www.lenovo.com/supportThis section provides instructions on how to install or replace a PCI card.Your computer has one standard PCI card slot and one PCI Express x16 graphicscard slot.To install or replace a PCI card:1. Open the computer cover. See “Opening the computer cover” on page 14.2. Rotate the card retainer to the open position.3. Remove the new PCI card from its static-protective package.Figure 9. Installing the memory module18 User Guide