What "loading BIOS" actually means

Loading BIOS means starting up the firmware that runs before your operating system does. When you turn on your computer, BIOS (Basic Input/Output System) is the first thing that runs — it checks your hardware, finds your hard drive, and hands control over to Windows, macOS, or Linux. You do not usually "load" BIOS yourself. It loads automatically every time you restart.

The confusion comes from the phrase "load BIOS defaults" or "load factory settings," which is something you might do inside the BIOS menu if your computer is acting strange. That means telling BIOS to forget any custom settings you or a technician made and go back to how it shipped from the factory.

A different thing entirely is flashing BIOS — updating the firmware itself with a new version from the manufacturer. That is a separate, more technical process that most people never need to do.

Key Takeaways

  • BIOS loads automatically when you turn on your computer; you do not manually load it under normal circumstances.
  • If someone tells you to "load BIOS defaults," they mean reset BIOS settings to factory state, which you do from inside the BIOS menu.
  • Entering the BIOS menu requires pressing a specific key during startup — usually Delete, F2, F10, or F12 depending on your computer brand.
  • Resetting BIOS to defaults can fix boot problems or strange hardware behavior, but it erases any custom settings like overclocking or boot order changes.

When you might hear "load BIOS" and what it actually means

The phrase usually comes up in three situations. First, a technician might say "load BIOS defaults" when your computer will not start properly or is behaving erratically. Second, you might see it in a computer manual under troubleshooting. Third, someone might mention it if you have overclocked your processor or changed other advanced settings and want to undo those changes.

In all three cases, the person is talking about resetting BIOS to its original state, not about loading BIOS from scratch. Your computer does that loading on its own every time it powers up.

How to enter the BIOS menu on your computer

To access BIOS and see its settings (or reset them), you need to enter the BIOS menu during startup. Turn on your computer and when ready start pressing a specific key repeatedly — before the Windows or Apple logo appears. The key varies by manufacturer:

  • Dell computers: Press F2 or Delete
  • HP or Compaq: Press F10 or Escape, then F10
  • Lenovo: Press F1, F2, or Delete (depends on model)
  • ASUS: Press Delete or F2
  • Acer: Press Delete or F2
  • Apple (Mac): Hold Command + Option + P + R during startup to reset NVRAM, which is similar to BIOS defaults

If you are not sure which key to press, look at the startup screen — many computers display "Press [key] to enter Setup" for a few seconds. If you miss it, restart and try again. You have only a few seconds to catch it.

What happens when you load BIOS defaults

Once you are in the BIOS menu, look for an option called "Load Setup Defaults," "Load Factory Defaults," "Reset to Defaults," or something similar. The exact name and location depend on your computer model. Select it, and BIOS will erase any custom settings and return to how it was configured when the computer left the factory.

This solves several problems: computers that will not boot, hardware that is not recognized, or strange crashes that started after someone changed BIOS settings. It also undoes any overclocking, which is when someone increases processor speed beyond the manufacturer's rating to squeeze out more performance.

The downside is that you lose any intentional changes you made. If you set a custom boot order (which drive to start from), a password, or other settings, resetting BIOS erases all of that. Write down any custom settings before you reset if you think you might want them back.

The difference between loading defaults and flashing BIOS

Do not confuse resetting BIOS to defaults with flashing BIOS, which means updating the firmware itself. Flashing is a more advanced task that involves downloading a file from the manufacturer's website and running an update tool. Most people never need to flash BIOS unless the manufacturer releases an update that fixes a specific hardware problem or security issue.

Loading defaults is safe and reversible — you can always change settings back. Flashing BIOS is riskier because if something goes wrong during the update, your computer might not start at all. Unless a technician or the manufacturer specifically tells you to flash BIOS, stick with loading defaults if you need to reset things.

When you should not reset BIOS yourself

If your computer will not start at all — no lights, no fan noise, nothing — BIOS is probably not the problem. That usually points to a power supply issue or a hardware failure. Resetting BIOS only helps if the computer powers on but will not complete startup, or if it starts but behaves strangely.

If you are not comfortable entering BIOS menus, or if you are worried about accidentally changing something, ask a technician to do it. Resetting BIOS is straightforward, but it is also straightforward to accidentally change other settings while you are in the menu. A technician can do it in minutes and make sure nothing else gets altered.

Frequently Asked Questions

Will resetting BIOS to defaults erase my files?

No. BIOS is firmware that runs before your operating system loads. Resetting it does not touch your documents, photos, or any files on your hard drive. It only erases BIOS settings like boot order or passwords you set inside BIOS itself.

What if I press the wrong key and cannot get into BIOS?

Nothing bad happens. Your computer will just boot normally into Windows or macOS. Restart and try a different key, or look up the correct key for your specific computer model online. You can try as many times as you want without causing damage.

Can I reset BIOS if my computer is running slowly?

Resetting BIOS might help if the slowness started after someone changed BIOS settings, but it usually will not fix general slowness. Slow performance is more often caused by too many programs running at startup, a full hard drive, or malware. Check those things first before resetting BIOS.

Do I need to reset BIOS after installing new hardware?

Not usually. Modern computers detect new hardware automatically. You might need to enter BIOS to change the boot order if you installed a new hard drive and want to boot from it, but you do not need to reset BIOS to factory defaults. Just change the specific setting you need.

Is it safe to reset BIOS on a laptop?

Yes, it is just as safe on a laptop as on a desktop. Make sure your laptop is plugged in before you start, so the battery does not die during the process. Otherwise, the steps are the same — restart, press the BIOS key, find the reset option, and confirm.