Dell PowerEdge C8000 Getting Started page 33

Turning On the Sleds
To turn on the C8220 or C8220X compute sled, press the power button on
each sled, or power on the sled using the baseboard management controller.
When power is applied to the sled, the power-on indicator on front of the sled
will light up green. When installed into the server enclosure, the C8000XD
storage sled automatically powers on. See Using the Baseboard Management
Controller Guide at dell.com/support/manuals.
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Getting Started With Your System