HP LC 2000 - Manual (Page 164)

Chapter 13 Alternative Rack Mounting
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13. Press in the release latches on each slide, and push the NetServer all the
way back into the rack. See Figure 13-9.
The blue Slide Release buttons in the Bezel moldings on each side of
chassis’s front edge must click into the latches in the column adapters on
the two front rack columns.
Figure 13-9. Pressing in the Release Latches
14. Verify the NetServer will slide all the way into the rack, before continuing
with the procedures.
15. Go to "Attaching the Cable Management Arm" before securing the HP
NetServer in the rack.