Windows won’t start

Windows recovery or installation USB won't boot

You've created a Windows installation or recovery USB drive to fix a boot problem, but the PC either ignores it entirely, boots normally past it, or shows an error when trying to start from it.

Difficulty
Moderate
Time
20–60 minutes
DIY cost
$0
Pro cost
$60–$120

Symptoms

  • PC boots to normal Windows (or its usual failure) instead of the USB
  • BIOS doesn't list the USB drive as a boot option
  • USB drive works fine on another computer
  • Error appears specifically when trying to boot from the USB

Likely causes

  • CommonUSB not selected in the one-time boot menu or boot orderThe PC needs to be explicitly told to boot from USB, either via a boot menu key or BIOS settings.
  • CommonUSB drive created incorrectly or with a corrupted downloadA bad or incomplete download when making the USB can result in unbootable media.
  • PossibleBoot mode mismatch (UEFI vs Legacy) between the USB and BIOS settingsA USB created for UEFI boot won't start on a PC set to Legacy mode, and vice versa.
  • PossibleSecure Boot blocking a non-Microsoft-signed recovery toolCertain third-party recovery USBs aren't signed for Secure Boot.
  • Less commonUSB port issue or a marginal/failing USB driveSome ports (especially older USB 3.0 in certain BIOS versions) have had compatibility quirks with boot media.

What to do

  1. Restart and press the one-time boot menu key for your PC brand (often F12, F9, or Esc) and select the USB drive explicitly from that list rather than relying on the general boot order.
  2. If the USB doesn't appear in that menu at all, try a different USB port, preferably a USB 2.0 port if available, since some BIOS versions handle these more reliably for boot media.
  3. Recreate the USB drive using the official Microsoft Media Creation Tool on a different, known-working USB drive, since a bad download or write can make media unbootable.
  4. Check BIOS/UEFI boot mode settings; ensure they're set to UEFI if the USB was created for UEFI boot (the standard for modern Windows installers).
  5. If a Secure Boot violation appears when trying to boot the USB, temporarily disable Secure Boot in BIOS to test, since some recovery tools aren't signed.
  6. Test the same USB drive on a different computer to confirm it's actually bootable and the problem is specific to this PC's settings.
  7. If the USB still won't boot after recreating it and adjusting BIOS settings, try a DVD installer instead if the PC has an optical drive, as an alternative boot method.

Tools and parts

  • USB drive (8GB or larger)
  • Access to another working computer to create the USB

When to call a pro

If you can't get any recovery media to boot despite trying different ports, USB drives, and BIOS settings, a technician can determine whether it's a BIOS compatibility issue or a deeper hardware problem.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.