Perform a warm shut down on the server. Run:
ssh -l root <hostname> shutdown -h now
Finish seating the HDD by pushing firmly until resistance is felt.
The retention tab will 'click' when the HDD has seated properly.
Slide the server back into the rack.
If the green retention plunger is still in the upright position, twist it 90 degrees to release it. This will secure the server.
Connect the 10G NIC cable.
Press the power button to power-on the server.