Dell PowerEdge 2900 - Manual (Page 113)

Installing System Components
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8 Reconnect all cables from the system board to the SAS backplane board, the control panel, and any
tape or hard drives in the peripheral or flex bays.
9 Close the system. See "Closing the System" on page 53.
10 Reinsert the power supplies. See "Installing a Power Supply" on page 63.
11 Reconnect the system to the peripherals and electrical outlet, and turn on the system.