IBM 620410U - IntelliStation E - Pro 6204, User Manual

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Press and hold the power control button for more than 4 seconds to cause an
immediate shutdown of the computer and place the computer in standby mode.
You can use this feature if the operating system stops functioning.
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If you cannot use the power control button to turn off your computer, disconnect
the computer power cords from the electrical outlets.
Note: After disconnecting the power cords, wait approximately 15 seconds for
your computer to stop running.
Important
In some circumstances, your computer might not turn off immediately when
you press the power control button. If this happens, press and hold the
power-control button until the computer turns off.
Chapter 3. Operating your computer
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