IBM System x3550 M5 Type 5463 Installation And Service Manual page 49

v The server can be turned off by Wake on LAN feature with the following
limitation:
Note: When you install any PCI adapter, the power cords must be disconnected
from the power source before you remove the PCI Express riser-card assembly.
Otherwise, the Wake on LAN feature might not work.
v The Integrated Management Module II (IMM2) can turn off the server as an
automatic response to a critical system failure.
Chapter 1. The IBM System x3550 M5 server
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