The fastest way to reach your BIOS

Your BIOS is a program that runs before Windows even starts — it controls what hardware your computer recognizes and how it behaves at startup. To reach it on Windows 10, restart your computer and press a specific key repeatedly as it boots up. The key varies by manufacturer: Dell and Lenovo machines usually need F2, HP and Compaq need F10, ASUS needs Delete, and Acer needs F2 or Delete. If you are not sure which one, try F2 first — it works on the majority of machines.

The timing matters. You need to start pressing the key the moment you power on the computer, before the Windows logo appears. If you miss the window, Windows will load normally and you will have to restart and try again. Some computers show a brief message on the startup screen telling you which key to press — watch for it.

If the function key approach does not work, Windows 10 offers a second route through the Settings menu that is slower but more reliable. This method works on any Windows 10 machine regardless of manufacturer.

Key Takeaways

  • Press F2, F10, or Delete repeatedly during startup to enter BIOS — the exact key depends on your computer's manufacturer.
  • You must start pressing the key the moment the computer powers on, before the Windows logo appears.
  • If you miss the startup window, restart the computer and try again — there is no way to enter BIOS after Windows has loaded.
  • Windows 10 Settings offers a backup route to BIOS through Advanced Startup, which works when the function key method fails.
  • BIOS changes affect how your hardware behaves, so write down any settings you change in case you need to undo them.

Using the function key method during startup

This is the standard approach and usually the fastest. Power off your computer completely — not sleep mode, but a full shutdown. Press the power button to turn it back on, then immediately begin pressing your manufacturer's key. Press it once per second or faster; do not hold it down continuously.

Watch the screen carefully. You will see the manufacturer's logo, then possibly a message like "Press F2 to enter Setup" or "Press DEL to enter BIOS." Once you see this message, keep pressing that key until the BIOS screen appears. The BIOS interface looks nothing like Windows — it is usually dark with white or colored text, and navigation happens through arrow keys and Enter rather than a mouse.

If Windows loads instead, you waited too long or pressed the wrong key. Restart the computer and try again. Some newer computers have a longer startup sequence, so you may need to press the key for several seconds before anything happens.

The Windows 10 Settings route when function keys do not work

If pressing function keys during startup does not open BIOS, use the Settings menu instead. Open Settings by pressing Windows key + I, then select System from the left menu. Click About at the bottom of the left sidebar, then scroll down and click Advanced startup options or Restart now under the "Recovery" section.

Your computer will restart and show a blue menu with several options. Click Troubleshoot, then Advanced options, then UEFI Firmware Settings. Click Restart and your computer will reboot directly into BIOS. This method bypasses the timing problem entirely because you are telling Windows to open BIOS rather than trying to interrupt the startup sequence.

This route takes longer than the function key method, but it works on every Windows 10 machine. Use it if you have tried the function key approach multiple times without success.

What you will see once you are in BIOS

The BIOS screen displays your computer's hardware settings in a text-based interface. You will see sections for storage devices, memory, processor information, and boot order — the sequence in which your computer checks for an operating system to load. Navigation uses arrow keys to move between options, Enter to select, and usually Delete or Escape to exit without saving changes.

Different manufacturers organize BIOS differently. Dell and Lenovo often use a menu structure with tabs at the top; HP uses a left sidebar; ASUS uses a top menu bar. Despite the layout differences, the core settings are similar across all machines. If you are looking for a specific setting, check the menu structure or look for a Help option within BIOS itself.

Do not change settings unless you know what they do. BIOS controls fundamental hardware behavior, and incorrect changes can prevent your computer from starting. If you make a change and something breaks, restart and enter BIOS again to undo it — most BIOS menus have a "Load Defaults" or "Reset to Factory Settings" option.

Common reasons people need to access BIOS

The most frequent reason is to change the boot order — the sequence in which your computer looks for an operating system. If you are installing Windows from a USB drive or running a recovery tool, you need to tell BIOS to check the USB port before the hard drive. This is usually in a section called Boot or Boot Order.

Another common task is enabling or disabling hardware features. Some computers let you turn off the built-in camera, microphone, or wireless card through BIOS. This is useful if you want to prevent certain hardware from being used. You might also need BIOS to enable virtualization features if you are running virtual machines, or to adjust fan speed if your computer is overheating.

Less commonly, people access BIOS to check hardware information — the amount of RAM installed, the processor model, or the storage capacity. This information is also available in Windows Settings, but BIOS shows the raw hardware details before any operating system modifications.

Exiting BIOS and saving your changes

Once you have made your changes, look for a Save and Exit or Exit and Save Changes option. This is usually at the bottom of the main menu or in a dedicated menu section. Press Enter to select it, then confirm when BIOS asks if you want to save. Your computer will restart and load Windows with the new settings applied.

If you want to leave BIOS without saving, look for Exit Without Saving or press Escape. This discards any changes you made and restarts your computer with the previous settings intact. Use this if you opened BIOS by accident or changed something and realized it was wrong.

After exiting BIOS, Windows will load normally. If you changed the boot order or enabled new hardware, you may see a brief message during startup about the changes. This is normal and does not indicate a problem.

Troubleshooting when you cannot reach BIOS

If neither the function key method nor the Windows Settings route opens BIOS, your computer may have a BIOS password set. If you set this password yourself and forgot it, you will need to contact your computer's manufacturer or a technician — there is no standard way to bypass a BIOS password. If you inherited the computer from someone else, ask them for the password.

Some business computers have BIOS locked by the IT department to prevent changes. If this is the case, you will not be able to access BIOS at all without administrator permission. Contact your IT support team if you need to make BIOS changes on a work computer.

If your computer is very old or uses legacy BIOS instead of UEFI, the function keys may be different or the Settings route may not work. Check your computer's manual or the manufacturer's website for the correct key. Alternatively, restart your computer and watch the startup screen carefully — most machines display the correct key during boot.

Frequently Asked Questions

Can I access BIOS from within Windows without restarting?

No. BIOS runs before Windows loads, so you must restart your computer to reach it. The Windows Settings method restarts your computer automatically and boots directly into BIOS, but you cannot access BIOS while Windows is running.

What if I change a BIOS setting and my computer will not start?

Restart and enter BIOS again, then look for a "Load Defaults" or "Reset to Factory Settings" option. This restores all BIOS settings to their original state. If your computer will not start at all, you may need to remove the CMOS battery inside the computer case for 30 seconds to force a reset — consult your computer's manual for the battery location.

Is it safe to change BIOS settings?

It depends on the setting. Changing boot order or enabling virtualization is safe. Changing voltage settings, clock speeds, or disabling core hardware can damage your computer or prevent it from starting. Only change settings you understand, and write down what you changed so you can undo it if needed.

Why does my computer not show the "Press F2" message during startup?

Some manufacturers hide this message by default. Try pressing the key anyway — it often works even if you do not see the prompt. If that fails, check your computer's manual or the manufacturer's support website for the correct key and timing.

Can I access BIOS on a Mac?

No. Macs use a different system called EFI or Firmware that serves a similar purpose, but it is accessed differently. This guide applies only to Windows 10 computers.