12. Reinstall the PCI riser-card assembly in PCI riser connector 1 if you haveremoved it previously (see “Installing a PCI riser-card assembly” on page 46).If you have other devices to install or remove, do so now. Otherwise, go to“Completing the installation” on page 139.Installing an optional DVD driveFor a list of supported optional optical disk drives for the server, seehttp://www.ibm.com/servers/eserver/serverproven/compat/us/.To install an optional DVD drive, complete the following steps.Alignment pinsDrive retention clip1. Read the safety information that begins on page vii and “Installation guidelines”on page 37.2. Make sure that the server is turned off, all external cables and power cords aredisconnected, and the cover has been removed. For more information, see“Turning off the server” on page 22 and “Removing the cover” on page 44.3. Remove the optical drive filler panel if it is installed. Locate the blue release tabon the rear of the optical drive filler panel; then, while you press the tab, pushthe optical drive filler panel out of the drive bay. Save the optical drive fillerpanel for future use.138 System x3650 M3 Types 4255, 7945, and 7949: Installation and User’s Guide