Dell PowerEdge 1650 Rack Installation page 30

Press the slide release latch at the side of each slide and push the system completely
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into the rack (see Figure 1-18).
Push in and turn the captive thumbscrews on each side of the front chassis panel to
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secure the system to the rack.
Installing the Cable-Management Arm
See "Installing the Cable-Management Arm" in "Four-Post Rack Installation."
Routing Cables
See the procedure "Routing Cables" in "Four-Post Rack Installation."
You have completed the installation of the rack kit in a two-post rack.
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Rack Installation Guide