Dell PowerEdge 2450 Installation And Troubleshooting Manual page 142

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Ensure that proper airflow is provided to components in the rack.

Do not step on or stand on any system/component when servicing other
systems/components in a rack.
        
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Observe the following guidelines when working with options:

Do not connect or use a modem or telephone during a lightning storm. There
may be a risk of electrical shock from lightning.

Never connect or use a modem or telephone in a wet environment.

Do not plug a modem or telephone cable into the network interface controller
(NIC) receptacle.

Disconnect the modem cable before opening a product enclosure, touching or
installing internal components, or touching an uninsulated modem cable or jack.

Do not use a telephone line to report a gas leak while you are in the vicinity of the
leak.
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Observe the following precautions for laser devices:

Do not open any panels, operate controls, make adjustments, or perform proce-
dures on a laser device other than those specified in the product's
documentation.

Only authorized service technicians should repair laser devices.
      
Before you remove the computer covers, perform the following steps in the sequence
indicated.