Starting cold
and running warm boot
One of the first objectives of
the A+ Core Hardware exam is to identify the basic terms, concepts, and functions
of a PC's boot processes. This includes the actions and the sequence of the
actions involved in starting the computer from a power-off status (cold boot)
or restarting a PC that's already running (warm boot). A cold boot starts
when the PC's power is switched on and a warm boot is performed whenever
the PC is restarted or reset with the power already on. One of the most common
ways to start the warm boot is by using the official keystrokes of the PC
repair technicians' secret club--Ctrl+Alt+Delete—but then you already knew
that.
A cold boot is the whole BIOS
enchilada. It causes the BIOS to guide the PC's boot sequence through a series
of steps that verify the computer's integrity. The exact steps vary slightly,
depending on just about everything about or in your PC (manufacturer, BIOS, and
hardware configuration). A warm boot does not run the POST and reestablishes
the operating system and drivers on the PC.
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