Why might you disable quick booting features in BIOS when you are troubleshooting a problem

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What is fast startup?
Is your PC truly shutting down?
Why disable fast startup?
How to enable and disable fast startup on Windows 10

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If you need to recover data off a system that won’t boot, install the drive in a working system.	True
If you see smoke or smell burning, you should immediately open the case to try to identify the component that is causing it.	False
To move a hard drive to another computer for the purposes of accessing the data, you always need to first physically install it in a drive bay.	False
A clicking noise coming from a system could indicate that a hard drive is failing.	True
A Molex connector supplies +3.3V, +5V, and -12V voltages.	False
What is a typical symptom of a CMOS battery failure?	Time and settings lost
If you are trying move a hard drive from a non-working computer to a working computer for the purposes of accessing the data on the drive, what must you have?	An Administrator password before you can access data on the drive
What is an indication that an inadequate power supply is the source of an intermittent problem?	The power supply whines when you first turn on the system
A missing standoff could create what potential problem?	A short on the motherboard
If you suspect your system is overheating, how can you determine the CPU temperature?	Go into UEFI/BIOS setup and find the temperature monitors for the system
Which of the following is NOT a solution to an overheating problem?	remove the covers from empty expansion slots
What does a single beep or no beep imply during the startup of a computer?	All POST tests passed
If you see an error message that reads "Processor thermal trip error", what is the likely problem?	The processor has overheated
What should you do if the system continually reboots and you can’t read the error message produced on a blue screen?	Press F8 as Windows starts up
What component of a motherboard is not considered to be a field replaceable unit?	chipset
Why might you disable quick booting features in BIOS when you are troubleshooting a problem?	To see a full POST report
Which of the following protects your computer from brownouts or sags?	UPS
When testing a laptop power connector, how close should the voltage measured be to the accepted voltage of the laptop?	+-5%
What is an auto-switching AC adapter?	An adapter that can use 110V or 220V AC power
One long and two short beeps when using an Award BIOS is an indication of what issue?	A video problem
Three long beeps during the POST sequence on an Intel BIOS are an indication of what type of issue?	keyboard controller problem
A PCIe 6/8 pin connector for providing auxiliary power to PCIe cards utilizes what voltage?	+12v
What Intel socket recommends the use of a liquid cooling system?	LGA2011
What is the most used rail on a power supply?	+12V
If the startup BIOS can’t find a device to use to load the operating system, what error message is likely to appear?	Fixed disk error
What are the two highest heat producing components in a system?	-Processor -Video card
What is a typical sign that a capacitor is bad or has failed?	-The capacitors are discolored -The capacitors have crusty corrosion at the base of the capacitors.
Depending on the manufacturer of the BIOS, what two different POST beep code sequences indicate a memory error?	-Continous short beeps -Continous three short beeps and then a pause
A cooler with heat pipes, which contain a small amount of liquid that becomes a vapor when heated, allowing heat to be drawn away from the CPU without the use of a fan is known by what two terms?	-passive CPU cooler -fanless CPU cooler
CPU coolers are typically made using what two different types of materials?	aluminum coppper

Fast startup is a feature first implemented in Windows 8 and carried over to Windows 10 that provides a faster boot time when starting up your PC. It's a handy feature and one that most people use without even knowing, but there are others who disable it immediately when they get their hands on a new PC.

Let's take a look at exactly how fast startup works, why you might want to enable or disable it, and how to do so.

What is fast startup?

Intel Motherboard

Windows PCs typically operate in a number of Advanced Configuration and Power Interface (ACPI) power states. An S0 power state, for example, is when your PC is running and ready to respond to your input. There are a number of sleep states, including S1, S2, and S3, and there's also a hybrid sleep state where hibernation is used in tandem with a sleep state.

Hibernation is considered an S4 power state. While hibernating, your PC will seem like it's completely off, but there will be a saved hibernation file ready to be used to boot back to where you were during your last user session. Some power is usually still routed to peripherals so that you can, say, tap your keyboard and have the PC boot.

An S5 power state (soft off) is when your PC is shut down and rebooted completely. There's no hibernation file and no saved user session. There is also a G3 power state, which is when your PC consumes absolutely no power and is completely turned off.

With fast startup enabled, choosing to shut down your PC might look like you're completely shutting things down, but in reality, your PC is entering a mix between a shutdown and hibernation. A hibernation file is indeed used, although it is smaller than usual. Why? You're logged off before the file is created, meaning your session is not recorded. The speed boost comes from the Windows kernel being saved on your hard drive and loaded when booting.

Is your PC truly shutting down?

While fast startup is a pretty harmless tool that can deliver a considerable startup speed boost, especially to PCs using hard-disk drives (HDD), some people prefer to have their PC truly shut down when they click the "Shut down" button on their PC.

Power options in the Windows 10 Start button

In a post on the PC Master Race subreddit, a user pointed out that fast startup was re-enabled in a Windows 10 update following the release of the Fall Creators Update. Following the April 2018 Windows 10 update, Fast Startup was again re-enabled on my own PC, and it seems to have kicked in again following the May 2019 Update.

If you're among the group of people who disable fast startup on their Windows 10 PC, you might want to recheck the settings to see if it's still off.

Why disable fast startup?

Leaving fast startup enabled shouldn't harm anything on your PC — it's a feature built into Windows — but there are a few reasons why you might want to nevertheless disable it.

One of the major reasons is if you're using Wake-on-LAN, which will likely have problems when your PC is shut down with fast startup enabled. Others would like to save the hard drive space that is usually taken up with the hibernation file, and Linux users will likely see complications with dual boot and virtualization. Furthermore, some users have even reported that power buttons on their keyboard will not work and fans in their PCs will continue spinning. These problems are by no means across the board, but they can prove to be frustrating. Finally, Windows 10 updates might not install properly if you have fast startup enabled.

Left: after shutting down with fast startup enabled. Right: after shutting down with fast startup disabled.

Your reason for disabling fast startup might simply have to do with wanting to see your PC truly shut down when you choose to shut down, especially when working with a speedy solid-state drive (SSD), or to have the processor (CPU) uptime reset after booting.