HP ProLiant DL20 Gen10 Plus Maintenance And Service Manual page 156

9. Install the access panel.
10. Install the server into the rack.
11. Connect all peripheral cables to the server.
12. Connect the power cords:
a. Connect each power cord to the server.
b. Connect each power cord to the power source.
13. Power up the server .
14. If removed, install the front bezel.
Installing the processor 156