Learn How to Change Boot Order in BIOS

What Is Boot Order and Why It Matters

Boot order refers to the sequence in which your computer checks different storage devices when it powers on. When you start your computer, it needs to find and load the operating system—whether that's Windows, macOS, or Linux. Your BIOS (Basic Input/Output System) is the firmware that controls this process before your operating system even loads.

By default, most computers are set to boot from the hard drive or solid-state drive where your operating system is installed. However, situations arise where you might need to change this order. For example, if you want to install a fresh copy of Windows, you would need to boot from a USB drive or DVD containing the installation files. Similarly, if your main hard drive fails, you might want to boot from an external drive temporarily. System administrators often need to change boot order for troubleshooting, disk cloning, or running diagnostic tools.

Understanding boot order gives you greater control over your computer's startup process. Rather than being locked into one configuration, you can adjust the sequence based on your current needs. This knowledge becomes particularly valuable when dealing with computer problems or performing advanced maintenance tasks.

The boot order typically includes options like:

• Internal hard drives (HDD or SSD)
• External USB drives
• CD/DVD drives
• Network boot options (PXE boot)
• M.2 or NVMe drives

Practical Takeaway: Boot order determines which device your computer checks first for an operating system. Knowing how to change it allows you to use USB drives for installation, recovery, or troubleshooting purposes.

Understanding Your Computer's BIOS

The BIOS is firmware stored on a chip on your motherboard. It runs before your operating system loads and handles fundamental hardware functions like checking that all your components are working properly. Think of it as the computer's initialization program—it's what actually gets things started before Windows or another OS takes over.

There are two main types of BIOS systems: traditional BIOS and UEFI (Unified Extensible Firmware Interface). UEFI is the newer standard and offers more features and better security. Most computers manufactured in the last ten years use UEFI rather than legacy BIOS. However, both systems accomplish the same goal: managing hardware before the operating system loads.

You access the BIOS by pressing a specific key during the startup process—before your operating system begins loading. The exact key varies by manufacturer. Common keys include Delete, F2, F10, F12, and Escape. If you're unsure which key your computer uses, you can usually find this information on the splash screen that appears when you first power on your computer, or by checking your computer or motherboard's manual.

Once you enter the BIOS, you'll see various settings related to your hardware and system behavior. These include memory settings, processor information, temperature monitoring, and security options. The BIOS interface typically uses a text-based menu system that you navigate with your keyboard rather than a mouse. Different manufacturers like Dell, HP, Lenovo, ASUS, and others design their BIOS interfaces differently, so the exact layout varies.

Practical Takeaway: BIOS is the firmware layer that starts before your operating system. Access it by pressing a specific key during startup, and navigate using your keyboard. Knowing your BIOS type and manufacturer helps you locate boot order settings more quickly.

Accessing BIOS on Different Computer Types

The process for entering BIOS varies slightly depending on your computer's manufacturer and whether you're using a desktop or laptop. For most desktop computers and traditional laptops, the method is straightforward: restart your computer and press the appropriate key repeatedly during the startup sequence. Timing matters—you need to press the key after the computer powers on but before the operating system begins loading. This window is typically just a few seconds.

For Dell computers, the BIOS access key is usually F2, though some models use Delete. HP and Compaq computers generally use F10 or Escape. ASUS and many motherboard manufacturers use Delete or F2. Lenovo laptops often use F1 or Fn+F1. If you're unsure, restart your computer and watch carefully for a message on the splash screen. It often displays text like "Press F2 to enter Setup" or "Press Delete to enter BIOS."

For newer computers with Windows 10 or 11, there's an alternative method through the Settings application. You can access advanced startup options by going to Settings, then System, then Recovery. From there, select "Restart now" under Advanced startup. This will show you a menu with an option to enter UEFI Firmware Settings. This method is particularly useful if you're having trouble timing the key press during startup.

Mac computers use a different system altogether. If you need to access Mac's firmware settings (now called Startup Security Utility on newer Macs), you typically restart while holding Command and R, or on Apple Silicon Macs, power on and hold the power button. This opens Recovery Mode rather than traditional BIOS.

If you're using a computer provided by your workplace, your IT department may have restricted access to BIOS settings for security reasons. In that case, you'll need to contact them before making any changes.

Practical Takeaway: Each manufacturer uses different keys to access BIOS. Check your computer's startup screen for the correct key, or use Windows Settings to access UEFI Firmware Settings on modern Windows computers.

Step-by-Step Instructions for Changing Boot Order

Once you've entered the BIOS, locating the boot order settings is your next step. In most BIOS interfaces, boot settings appear in a menu labeled "Boot," "Boot Options," "Boot Settings," or "Startup." Look for these terms in the main menu. The boot order section displays a list of available devices, usually numbered 1, 2, 3, and so on, representing the priority order.

Device 1 (or First Boot Device) is checked first when your computer starts. If it doesn't find a bootable operating system on Device 1, it moves to Device 2, and so forth. To change which device boots first, you need to move it to position 1 in the list.

Here's the typical process:

• Navigate to the Boot menu using your arrow keys
• Locate the device you want to boot from (for example, "USB Drive" or "External HDD")
• Select that device using Enter or another designated key (often shown on screen)
• Move it to the top position using the designated key combination (commonly + and - keys, or Page Up and Page Down)
• Once repositioned, press F10 or another save key to store the changes
• Your computer will restart

The exact key combinations differ between manufacturers. Most BIOS interfaces display instructions at the bottom of the screen showing which keys perform which actions. Common instructions include "Use +/- to move," "Use Enter to select," or "Press F10 to Save."

Some BIOS systems offer a "One-Time Boot Menu" option instead. This allows you to select a boot device for just the next startup without permanently changing the order. You access this menu by pressing a different key during startup—often F12, F11, or Escape. This method is helpful if you only need to boot from a different device once.

After saving your changes and restarting, your computer will attempt to boot from the device you selected. If there's no bootable operating system on that device, you may see an error message. In that case, restart again and change the boot order back, or use the One-Time Boot Menu for the next attempt.

Practical Takeaway: Locate the Boot menu in BIOS, select your desired boot device, move it to position 1 using the displayed key combinations, and press the Save key (usually F10) before restarting.

Common Boot Order Scenarios and Solutions

Several situations commonly require changing boot order. Understanding how to handle each helps you manage your computer more effectively. One frequent scenario is installing a new