IBM System x3750 M4 Installation And Service Manual page 124

Statement 8
CAUTION:
Never remove the cover on a power supply or any part that has the following
label attached.
Hazardous voltage, current, and energy levels are present inside
any component that has this label attached. There are no
serviceable parts inside these components. If you suspect a
problem with one of these parts, contact a service technician.
Statement 19:
CAUTION:
The power-control button on the device does not turn off the electrical current
supplied to the device. The device also might have more than one connection
to dc power. To remove all electrical current from the device, ensure that all
connections to dc power are disconnected at the dc power input terminals.
OFF
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System x3750 M4 Types 8722 and 8733: Installation and Service Guide