HPE ProLiant MicroServer Gen11 - Page 76

19. If you are not immediately installing the new processor, install the processor socket dust cover:
CAUTION:CAUTION: Do not press down on the dust cover. Pressing down on the dust cover might damage the processor socket.
a. Close the processor load plate, and then engage the hinge lever.
HPE ProLiant MicroServer Gen11 Maintenance and Service Guide 76