Dell PowerEdge R310 Getting Started With page 7

Securing the Power Cables
Bend the system power cables into a loop as shown in the illustration and
secure the cables to the brackets using the provided strap. Plug the other
end of the power cables into a grounded electrical outlet or a separate
power source such as an uninterrupted power supply (UPS) or a power
distribution unit (PDU).
Turning On the System
Press the power button on the system and on the optional monitor if used.
The power indicators should light.
5
Getting Started With Your System