Turning Off The Computer - IBM IntelliStation Z Pro 6223 Installation Manual

Turning off the computer

Note: When you connect the power cord to the computer and an ac power source,
the power-supply fan will run and continue to run when the computer is in standby
mode to provide cooling to the power supply.
When you turn off the computer and leave it connected to ac power, the computer
can respond to requests, such as a remote request to turn on the computer. To
remove all power from the computer, you must disconnect it from the power source.
Some operating systems require an orderly shutdown before you turn off the
computer. See your operating-system documentation for information about shutting
down the operating system.
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IntelliStation Z Pro Type 6223: Installation Guide