HP ProLiant DL320 G3 Server - Manual (Page 23)

Server operations 23
c. Lift the front of the assembly slightly and unseat the riser boards from
the PCI riser board connectors.
Installing PCI riser board assembly
CAUTION: To prevent damage to the server or expansion
boards, power down the server and remove all AC power cords before
removing or installing the PCI riser board assembly.
1. Align the PCI riser board assembly with the corresponding connectors on the
system board and install it into place.