To help protect a computer from being improperly turned off when it's running, the power button will not turn off a computer. If your computer is frozen or encountering other problems and needs to be turned off, press and hold down the power button without letting go for 5 to 10 seconds. Holding down the power button allows you to turn off the computer.
If the computer is working fine and you want to power down the computer, see our how to shut down a computer steps for instructions on how to shut down all types of computers.
Tip: While a computer is running, pressing the power button may put the computer into sleep mode. When a computer is in sleep mode, the power indicator usually flashes and pressing a button on the mouse or keyboard wakes up the computer.
Finally, if you have a laptop computer and following the above steps does not turn off the computer, unplug the computer and remove the battery.
Additional information
What should I do when a computer freezes or locks up?
No power or computer does not turn on.
See our power supply definition for further information and related links.
Computer power supply help and support.
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