PC will not boot when 'seure boot' is enabled

[ppeetteerr]

Hello,

I've cleared the secure boot keys and  the re-loaded the HP factory default keys but didn't help.

I've updated the HP bios.

Would be grateful for any help  or advice

Regards

[Deep_World]

Hi  @ppeetteerr 
 
Welcome to the HP Support Community!

Thank you for reaching out.

 I understand that your HP All-in-One 24-cb0000 series PC is unable to boot when Secure Boot is enabled. I appreciate the troubleshooting you've already completed, including clearing and reloading the Secure Boot keys and updating the BIOS.

To assist you further, kindly share the below details:

• Does the PC display any error message, beep code, or black screen when Secure Boot is enabled?
• Are you running the original factory-installed Windows 11, or was Windows reinstalled at any point?
• Have any hardware changes been made recently, such as adding/replacing an SSD, HDD, RAM, or graphics device?
• Is the system able to boot normally when Secure Boot is disabled?
• Do you see the boot drive listed in the BIOS under Storage or Boot Options?

In the meantime, kindly try the below steps and confirm : 

1. Load BIOS Default Settings
   • Restart the PC and press F10 repeatedly to enter BIOS.
   • Select Restore Defaults or Load Setup Defaults.
   • Save and exit the BIOS.
   • Re-enable Secure Boot and test.
2. Verify Boot Mode
   • Enter BIOS Setup (F10).
   • Confirm that Legacy Support is disabled.
   • Ensure the system is configured to boot in UEFI Mode, as Secure Boot requires UEFI.
3. Run HP Hardware Diagnostics (Click here for steps )
   • Power on the PC and repeatedly tap F2.
   • Run both the Storage Test and Memory Test to verify hardware health.

I hope this helps.