Dell PowerEdge R300 Getting Started With page 10

Installing the Rail and System in a Rack
Install the system in the rack once you have read the "Safety Instructions"
located in the rack installation documentation for your system.
See your rack installation documentation for instructions on installing your
system in a rack. For power and cooling guidelines, see the rack capacity
planner tool on www.dell.com.
Connecting the Keyboard, Mouse, and Monitor
Connect the keyboard, mouse, and monitor (optional).
The connectors on the back of your system have icons indicating which cable
to plug into each connector. Be sure to tighten the screws (if any) on the
monitor's cable connector.
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Getting Started With Your System