Dell PowerEdge C6220 II Owner's Manual page 272

18 Installing a Cooling Fan" on page 157.
19 Replace the system-board assemblies. See "Installing a System-Board
Assembly" on page 171.
20 Close the system, see "Closing the System" on page 152.
21 Reconnect the system to its electrical outlet and turn on the system,
including any attached peripherals.
272 | Removing and Installing System Components