IBM System x3650 M3 4255 Installation And User Manual page 39

v If the operating system stops functioning, you can press and hold the
power-control button for more than 4 seconds to turn off the server.
v The IMM can turn off the server as an automatic response to a critical system
failure.
v You can turn off the server through a request from the IMM.
Chapter 1. The System x3650 M3 server
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