How to Change the Boot Sequence on a PC
Changing your computer’s boot order is a useful skill that can help you install a new operating system, boot from a USB drive, run system diagnostics, or troubleshoot startup problems. While the process may sound technical, it is actually quite straightforward once you understand the steps involved.
In this complete step-by-step guide, you will learn what the boot order is, why you might need to change it, and how to modify it safely on most computers. This article is written for beginners and advanced users alike, with clear explanations and practical tips.
What Is Boot Order?
The boot order (also called boot sequence or boot priority) determines which device your computer checks first when it starts up. Each time you power on your computer, the system firmware looks for an operating system to load based on this predefined order.
Common boot devices include:
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Internal hard drive or SSD
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USB flash drive
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External hard drive
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DVD or CD drive
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Network boot (PXE)
For most users, the internal drive is set as the first boot device by default.
Why Would You Need to Change the Boot Order?
There are several common situations where changing the boot order is necessary or helpful.
You may need to change the boot order to:
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Install Windows, Linux, or another operating system
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Boot from a recovery or repair USB drive
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Run hardware diagnostic tools
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Access a live operating system environment
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Troubleshoot startup or disk problems
In these cases, your computer must boot from an external device instead of the internal drive.
Understanding BIOS and UEFI
Before changing the boot order, it’s important to understand where this setting is located.
Modern computers use either BIOS (Basic Input/Output System) or UEFI (Unified Extensible Firmware Interface). UEFI is newer, faster, and more common on modern systems, but both serve a similar purpose.
The boot order is configured inside the BIOS or UEFI firmware settings, not within Windows or macOS itself.
How to Access BIOS or UEFI Settings
To change the boot order, you must first enter the BIOS or UEFI setup screen during startup.
Common Keys to Enter BIOS or UEFI
As soon as you turn on your computer, press one of the following keys repeatedly:
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Delete
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F2
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F10
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F12
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Esc
The exact key depends on your computer manufacturer. Many systems briefly display a message such as “Press F2 to enter Setup.”
If Windows loads normally, restart the computer and try again.
How to Change Boot Order in BIOS
On older systems or systems using traditional BIOS, the interface is usually text-based and controlled with the keyboard.
Step-by-Step Instructions (BIOS)
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Restart your computer.
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Enter the BIOS setup using the appropriate key.
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Look for a menu labeled Boot, Boot Order, or Boot Priority.
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Select the boot device list.
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Use the indicated keys (often +, –, or arrow keys) to move devices up or down.
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Set your preferred device as the first boot option.
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Save changes and exit (usually F10).
Your computer will restart using the new boot order.
How to Change Boot Order in UEFI
Most modern systems use UEFI, which often includes a graphical interface and mouse support.
Step-by-Step Instructions (UEFI)
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Restart your computer.
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Enter UEFI settings using the startup key.
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Navigate to the Boot section.
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Locate Boot Priority or Boot Option Priorities.
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Drag devices into the desired order or select them using dropdown menus.
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Set the device you want to boot from as the first option.
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Save changes and exit.
UEFI systems often make boot order changes more intuitive.
How to Boot From USB Without Changing Boot Order Permanently
If you only need to boot from a USB drive once, you may not need to change the boot order permanently.
Using the Boot Menu
Many computers provide a one-time boot menu.
Steps:
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Insert the USB drive.
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Restart the computer.
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Press the boot menu key (often F12, Esc, or F8).
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Select the USB device from the list.
This method is ideal for temporary tasks like installing an operating system or running recovery tools.
Preparing a Bootable Device
Changing the boot order only works if the device is bootable.
A bootable USB or DVD must contain valid startup files. Simply copying files to a USB drive is not enough.
Make sure:
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The USB drive was created using proper tools
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The operating system or utility supports your system type
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The file system is compatible (often FAT32 for UEFI)
If the device is not bootable, the system will skip it and move to the next option.
Common Boot Order Problems and Solutions
Computer Ignores the Boot Order
If your computer does not boot from the selected device:
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Ensure the device is properly connected
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Confirm the device is bootable
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Disable Secure Boot if necessary (for some tools)
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Check UEFI vs Legacy boot compatibility
Secure Boot Issues
Secure Boot may prevent unsigned operating systems or tools from loading.
If needed:
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Enter UEFI settings
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Temporarily disable Secure Boot
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Re-enable it after completing your task
Only disable Secure Boot when you trust the boot source.
Restoring the Default Boot Order
After completing your task, it’s a good idea to restore the default boot order.
This typically means setting your internal hard drive or SSD as the first boot device again. Doing so ensures faster startup and avoids unnecessary boot delays.
Simply return to BIOS or UEFI settings and move the internal drive back to the top of the list.
Differences Between Desktop and Laptop Systems
The process of changing boot order is similar on desktops and laptops, but laptops may use different keys to access firmware settings.
Some laptops also require pressing a special function key or holding a key while powering on.
Always refer to your device manufacturer’s documentation if you’re unsure.
Safety Tips When Changing Boot Order
Changing boot order is generally safe, but keep these tips in mind:
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Do not change unfamiliar settings
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Save changes carefully before exiting
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Avoid disabling critical hardware unintentionally
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Use trusted bootable devices only
Incorrect changes can prevent the system from booting properly, though settings can usually be restored.
When You Should Change the Boot Order
You should change the boot order only when necessary, such as:
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Installing or reinstalling an operating system
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Running system recovery tools
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Testing hardware or software
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Performing data recovery
For everyday use, the default boot configuration is usually best.
Final Thoughts
Learning how to change your computer’s boot order is a valuable skill that gives you greater control over how your system starts. Whether you’re installing a new operating system, troubleshooting startup problems, or running recovery tools, understanding the boot process makes these tasks much easier.