Windows 10 Secure Boot Violation Message: Getting Past a Startup Security Warning
Instead of the Windows logo, a box appears: “Secure Boot Violation. Invalid signature detected.” The Windows 10 Secure Boot violation message appears before Windows starts and blocks the boot YYPAUS process.
Secure Boot checks that every piece of software loaded during startup is signed by a trusted publisher. If something is unsigned or its signature does not match, Secure Boot refuses to continue.
This often follows a BIOS update, a new graphics card, or a change to boot settings, rather than an actual attack.
Likely Reasons Behind the Problem
The violation is typically triggered by these:
- A BIOS update reset Secure Boot keys or changed settings.
- A new graphics card or expansion card has firmware the PC does not trust.
- A boot loader from another operating system or a tool was installed.
- Windows boot files were damaged or replaced.
ASUS motherboards, in particular, show this exact wording, though other brands have similar messages.
Simple Troubleshooting to Begin With
Check recent changes.
- Remove any newly added expansion cards or USB devices and restart.
- Enter the BIOS setup.
- Find the Secure Boot section and select the option to restore factory default keys.
- Load optimised default settings, then save and restart.
- If a BIOS update was just installed, check the manufacturer’s website for a newer version.
Restoring default keys resolves many cases after BIOS updates.
Next-Level Steps
Repair or work around the cause.
- If a new graphics card triggers the message, check its manufacturer’s site for a UEFI firmware update.
- Boot from a Windows 10 installation USB and run Startup Repair.
- If you installed another operating system or boot tool, remove it or use its signed boot loader.
- As a temporary test, disable Secure Boot in the BIOS and see whether Windows starts.
- If it does, update drivers and firmware, then turn Secure Boot back on.
Secure Boot should be re-enabled once the cause is fixed, since it protects against boot-level malware and is required for Windows 11.
Before You Go Further: Keep Your Files Safe
If BitLocker is enabled, changing Secure Boot settings may prompt for the recovery key. Have it ready before making changes. Do not leave Secure Boot permanently disabled. Use firmware updates only from the hardware manufacturer.
Wrapping Up
A Secure Boot violation is a trust problem during startup, usually caused by a firmware change or new hardware. Restore default keys, update firmware, and repair the boot files. Re-enable Secure Boot once Windows starts normally.
Keep a note of any firmware setting you change during this process. If something else stops working later, that record makes it easy to put each option back the way it was.