Removing a riser slot blank CAUTION: To prevent improper cooling and thermal damage, do not operate the server unless all PCI slots have either an expansion slot cover or an expansion board installed. Procedure Power down the server. Remove all power: Disconnect each power cord from the power source. Disconnect each power cord from the server. Do one of the following: Extend the server from the rack. Remove the server from the rack. Remove the access panel. Remove the riser cage. Remove the blank.