HP ProLiant DL120 User Manual page 35

Remove the PCI riser board assembly (on page 16).
5.
Remove the expansion slot covers.
6.
Install the expansion board.
7.
IMPORTANT:
properly.
Install the PCI riser board assembly (on page 17).
8.
Connect all internal cables for expansion boards.
9.
Install the access panel.
10.
Install the server into the rack.
11.
The server does not power up if the PCI riser board assembly is not seated
Hardware options installation 35