Dell POWEREDGE R710 - Manual (Page 7)

Getting Started With Your System
5
Securing the Power Cord
Bend the system power cable into a loop as shown in the illustration and
secure the cable to the bracket 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 uninterruptible power supply (UPS) or
a power distribution unit (PDU).
Turning on the System
Press the power button on the system and the monitor. The power indicators
should light.