Dell PowerEdge R900 Guide De Mise En Route page 12

Turning the System On
Press the power button on the system and the monitor (optional) to turn on the
system. The power indicators should light. Adjust the monitor's controls until
the displayed image is satisfactory.
Complete the Operating System Setup
If you purchased a preinstalled operating system, see the operating system
documentation that ships with your system. To install an operating system for
the first time, see the Quick Installation Guide. Be sure the operating system is
installed before installing hardware or software not purchased with the system.
10
Getting Started With Your System