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##### Hot Service, Replacement by Customer

The following components can be replaced while power is present on the server. These components can be replaced by customers.

Hot Service Components (server can have power present) | Notes
--- | ---
Hard drive | Drive must be offline
Hard drive filler panel | Needed to preserve proper interior air flow
Power supply | If three or more power supplies are in use
Fan module | If four or more fan modules are operational
Express module | Express module must be offline

Although hot service procedures can be performed while the server is running, you should usually bring it to standby mode as the first step in the replacement procedure. You do this by momentarily pressing the Power button on the front panel. See the descriptions of the Power OK LED and the Power Button in Power Off the Server (Power Button - Graceful) for more information about the standby mode.

##### Related Information

- Accessing Internal Components

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