IBM System x3750 M4 Type 8722 Installation And Service Manual page 38

The server can be turned off in any of the following ways:
v You can turn off the server from the operating system, if your operating system
v You can press the power-on button to start an orderly shutdown of the
v If the operating system stops functioning, you can press and hold the power-on
v The integrated management module (IMM) can turn off the server as an
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System x3750 M4 Types 8722 and 8733: Installation and Service Guide
supports this feature. After an orderly shutdown of the operating system, the
server will turn off automatically.
operating system and turn off the server, if your operating system supports this
feature.
button for more than 4 seconds to turn off the server.
automatic response to a critical system failure.