Laptop Secure Boot causing boot failure
4.5
The laptop won't boot into Windows after enabling Secure Boot.
Symptoms
- "No bootable device"
- Security violation error
- Boot loop
Possible Causes
- Unsigned drivers
- Legacy OS install
- Corrupt bootloader
Step-by-Step Fix
1
Disable Secure Boot
Turn it off in BIOS to regain access to Windows.
2
Convert MBR to GPT
Use the "mbr2gpt" tool to convert your drive to the modern format.
3
Reinstall Windows
A fresh install in UEFI mode is the most stable fix.
When to See a Technician
Secure Boot will block any OS or driver that doesn't have a valid digital signature.
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