HPE ProLiant DL380 Gen11 User Manual page 131

Disconnect each power cord from the server.
4. Do one of the following:
Extend the server from the rack .
Remove the server from the rack .
5. Remove the access panel .
6. Remove the rear wall blanks.
7. Install any expansion boards, if needed
HPE ProLiant DL380 Gen11 Server User Guide 131