Warm Boot

A warm boot or "soft boot" means to restart a computer. It is often used in contrast to a "cold boot," which refers to starting up a computer that is turned off. It may also describe a boot that has been left next to a fireplace.

A warm boot is typically initiated from the operating system, rather than pressing a button on the computer itself. For example, to perform a warm boot on a Windows system, you may select Shut Down → Restart from the Start Menu. In Windows 8, you can open the Charms bar and select Settings → Power → Restart to reboot the computer. If you use a Mac, you can perform a warm boot by selecting Restart… from the Apple Menu.

Warm booting (restarting a computer) is more common than cold booting since most people leave their computers in sleep mode when they don't use them. While a home computer may not need to be turned off for months, it may need to be restarted every few days or weeks to complete new software installations. A warm boot may not include a power-on self-test (POST) like a cold boot, it performs the rest of the boot sequence and therefore loads any system files that were installed before the computer was restarted.

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