Double boot

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This article is about a particular BIOS boot behaviour. For the processor exception, see Double fault.
"Double POST" redirects here. For the faux pas behaviour in message boards, see double posting.

Double boot (also known as cold double boot, double cold boot, double POST, power-on auto reboot, or fake boot) is a feature of the BIOS and may occur after changes to the BIOS settings or the system's configuration, or a power failure while the system was in certain sleep modes.

Changing some parameters in the BIOS will cause this issue, even for just setting a system as stock speeds, such as initializing the current CPU and memory clocks. When certain parameters, such as the ones before, from the BIOS are set, it will require a reboot.

If the computer didn't have any power and had just been plugged in these parameters will need to get implemented again, and since these parameters require a reboot, the computer will do a quick reset to implement these parameters that are set in the BIOS.[1] Even after the computer is turned off, these parameters won't need to be re-entered for as long as the power supply is still receiving power.

A double boot proceeds as such, the PC will power on for about two seconds, then off for about a second, then it will turn back on and display the POST screen and continue to boot up normally.


  1. ^ "Why does this mainboard auto reboot once after power on?". MSI FAQ. MSI. 2007-10-25. Archived from the original on March 17, 2011. Retrieved 2013-10-07.