IBM System x3650 M4 Type 7915 Problem Determination And Service Manual page 34

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
and the PCI-X 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.
16
IBM System x3650 M4 Type 7915: Problem Determination and Service Guide