Windows Fast Startup: Why "Shut Down" Isn't Quite Shutting Down and When to Turn the Feature Off

It's a familiar situation: the computer starts playing up — the sound goes, the printer can't be found, the internet slows down. You shut it down overnight, switch it on in the morning — and the problem is still there. But press "Restart" and everything works. It sounds odd, since shutting down ought to be "stronger" than restarting. The explanation is simple: Windows has Fast Startup switched on by default, and "shut down" isn't actually a full shutdown. Let's look at how it works, the problems it causes and when to turn it off.

How Fast Startup works

When you choose an ordinary "Shut down" with Fast Startup on, Windows closes your programs and signs you out, but the system kernel and loaded drivers aren't unloaded — they're saved to the drive, as with hibernation. The next time you switch on, Windows doesn't start from scratch but restores that saved state. That's why the computer starts faster, especially with an old hard drive.

A restart, by contrast, always goes through the full cycle: the kernel and drivers are loaded afresh. That's exactly why many problems disappear after a restart but not after a "shut down".

The advantages of Fast Startup

• The computer starts faster, especially with an HDD.
• No change to the user's habits — it all happens automatically.

On computers with modern SSDs, the difference in start-up time is usually only a few seconds.

The problems it causes

Faults that "won't go away"

If a driver hangs or misbehaves, shutting down doesn't "restart" it. The user shuts the computer down, but the fault remains until a proper restart is done.

Unfinished updates

Some Windows and driver updates need a full restart. If the user only ever "shuts down", updates can sit for weeks in a "Restart required" state.

Problems with two operating systems

If there's a second system — Linux or another version of Windows — the drive with the "frozen" Windows stays locked. The second system may not be able to access it or, worse, may damage data when writing to it.

External drives and hardware changes

Changes made while the computer is off — connecting a new drive, replacing devices, changing the BIOS — may not be recognised properly, because the system "wakes up" with the old configuration.

Wake-on-LAN and remote power-on

On some computers, after a "shut down" with Fast Startup, wake on LAN — needed for remote access to a work computer — doesn't work.

Can't get into the BIOS

On a number of computers with Fast Startup and fast boot, there isn't time to press the key that opens the BIOS settings.

Time problems

Combined with two operating systems and a clock that drifts, Fast Startup can make time confusion worse.

When to turn Fast Startup off

• The computer has two operating systems installed.
• The computer has an SSD, where the time saved is minimal.
• Problems that are "only cured by a restart" keep happening.
• You need to switch the computer on remotely over the network.
• Office computers, where it matters that updates are installed on time.
• External drives and hardware are connected and disconnected often.

If the computer is old, has a hard drive and there are no problems, Fast Startup can be left on.

A useful habit

Even if Fast Startup is left on, do a proper restart rather than a shut down every few days. And if something starts behaving strangely, the first step is to restart the computer — not to switch it off and on again.

Uptime without a restart

Task Manager shows the system's "Up time". If it says several weeks even though you shut the computer down every day, that's a direct result of Fast Startup. A system that hasn't restarted for weeks is prone to memory leaks, accumulated driver faults and unfinished updates.

For offices, the cleanest solution is often to combine the two: turn Fast Startup off and schedule updates to install with an automatic restart overnight. Staff then come in each morning to freshly started computers, with no half-installed updates and no gradual slowdown over the week.

What our technician does

1. Checks the power settings, Fast Startup and the system's uptime.
2. Turns Fast Startup off where it gets in the way, or tunes it.
3. Completes stuck updates and driver installations.
4. Sets up two operating systems and a shared drive to work correctly.
5. Configures Wake-on-LAN and remote access for work computers.

A real example

At an insurance company in Saburtalo, staff complained that their computers "barely work by the end of the week", even though they shut them down every evening. Our technician found the systems hadn't restarted for 3–5 weeks because of Fast Startup, updates were sitting uninstalled and the network card driver was gradually "eating" memory. Fast Startup was turned off (on the SSDs the difference at start-up was four seconds), the updates were installed and the driver updated. We also set updates to install automatically with a restart overnight. The complaints about "end-of-day slowness" stopped.

Call a technician

If your computer behaves strangely and only a restart helps, we'll come to any district of Tbilisi around the clock. Learn more on our computer setup, Windows installation and computer diagnostics pages.