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Fix BIOS that will not boot from USB

We'll check boot order, enable USB boot, use the one-time boot menu, and confirm the USB is bootable—or tell you when to escalate.

Troubleshooting · Devices & software
10–20 min
What you'll need
  • Bootable USB (e.g. Ubuntu, Windows installer)
  • Access to BIOS/UEFI setup
Step 1 of 5

Quick triage — pick your path

Quick triage — pick your path

Choose the option that matches what you see. You can jump straight to that section.

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Steps

Goal: Check boot order, enable USB boot, use the one-time boot menu, and confirm the USB is bootable.

  • Plug the USB in before power-on. Power on and watch the boot.
  • Good: The PC skips the USB and boots from the internal disk. Proceed to Use the one-time boot menu.
  • Bad: The PC boots from USB—no problem. If the USB does not work, recreate it.

Use the one-time boot menu

Goal: Select the USB for one boot without changing BIOS permanently.

  • Power on and press the boot menu key (F12, F11, Esc, or F8—varies by manufacturer). A menu lists boot devices.
  • Select the USB (e.g. “USB Hard Drive” or “UEFI: USB”). The PC boots from USB for that boot only.
  • Good: The USB appears and you can select it. Bad: The USB does not appear—see Change boot order.

Change boot order

Goal: Set the USB as the first boot device in BIOS.

  • Enter BIOS (F2, Del, F1, or Esc at power-on). Open Boot or Startup Options.
  • Move the USB or “Removable” above the internal disk. Save and exit (usually F10).
  • Reboot. The PC should try the USB first. If the USB still does not appear, enable “USB Boot” or “Legacy USB Support” in BIOS.

When to get help

Escalate if:

  • You have set boot order, enabled USB boot, and used the one-time menu but the PC still ignores the USB.
  • The USB may be faulty or the PC may not support USB boot.

Provide: PC model, BIOS version, and steps tried.

Verification

  • The USB appears in the one-time boot menu.
  • Selecting the USB boots the PC from the USB (e.g. live Linux or Windows installer).
  • Boot order or one-time menu works when you need to boot from USB.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. One-time boot menu Press F12/F11/Esc at power-on; select USB.
  2. Boot order Enter BIOS; move USB above internal disk.
  3. Enable USB boot Enable USB boot or Legacy USB in BIOS.
  4. Recreate USB Use Rufus or dd with correct partition scheme.
  5. Escalate Provide PC model, BIOS version, steps tried.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • PC model and manufacturer
  • BIOS/UEFI version
  • Boot order settings
  • Steps already tried

Does the PC skip the USB and boot from the internal disk?

USB is plugged in before power-on. PC goes straight to Windows or the internal OS.

Power on with USB plugged in. Skips USB: use one-time boot menu (F12/F11/Esc) or change boot order. USB in menu: select it and boot. USB not in menu: enable USB boot, try different port, or recreate USB.

Yes No

You can change your answer later.

Is the USB listed in the one-time boot menu?

Press F12, F11, or Esc at power-on to open the boot menu.

Power on, press the boot menu key. USB listed: select it and boot. USB not listed: enable USB boot in BIOS, try different port, or recreate the USB. See Use the one-time boot menu.

Yes No

You can change your answer later.

Select USB and boot

Select the USB from the boot menu. The PC should boot from the USB. If it still boots from the internal disk, the USB may not be bootable—recreate it with Rufus or dd.

Done

Change boot order in BIOS

Enter BIOS (F2/Del). Set USB or Removable as first boot device. Save and exit. Reboot. If USB still not in menu, enable USB boot or recreate the USB.

Done

Escalate

If boot order and USB format are correct but the PC still ignores the USB. Provide PC model and BIOS version.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would the PC not boot from USB?
Boot order puts the internal disk first, USB boot is disabled in BIOS, the USB is not bootable (wrong format), or the USB is plugged in after power-on. Check boot order and USB format.
Can I boot from USB without changing BIOS permanently?
Yes. Use the one-time boot menu (F12, F11, Esc, or similar) at power-on to select the USB for that boot only. No permanent BIOS change needed.
When should I escalate a USB boot failure?
If you have set boot order, enabled USB boot, and used the one-time menu but the PC still ignores the USB. The USB may be faulty or the PC may not support USB boot.

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