HP ProLiant DL60 Gen9 User Manual page 72

Release the power cord from the strain relief clip.
3.
Remove all power:
4.
Disconnect each power cord from the power source.
a.
Disconnect each power cord from the server.
b.
Remove the server from the rack (on page 18).
5.
Place the server on a sturdy, level surface.
6.
Remove the access panel (on page 18).
7.
If installed, remove the secondary PCI riser cage
8.
Disconnect the non-hot-plug power supply cables.
9.
("Remove the PCI riser
Hardware options installation 72
cage" on page 21).