HP ProLiant ML110 G2 Server - Manual (Page 43)

Hardware options installation 43
4. Remove the expansion slot cover retainer.
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.
5. Remove the expansion slot cover.
IMPORTANT: It may be necessary to remove the slot cover next to the slot in which you are
installing a board.