How can I enable Secure Boot on my HP laptop without encountering the "Start PXE over IPv4" error?

[Samjburns]

Hi, I am trying to enable Secure Boot on my HP EliteBook 840 in preparation for the Windows 11 update, so I needed to change the boot mode to UEFI Native (Without CSM) in order to get to the Secure Boot check box. Unfortunately, when I try to boot the laptop, instead of it going to Windows, it says "Start PXE over IPv4". I have tried most 'solutions' but to no avail. 

Here are my specs if needed:

Laptop: HP EliteBook 840 G1

OS: Windows 10 (wanting to change to 11 when it is released)

CPU: Intel Core i5-4300U

Storage: 256GB SSD

RAM: 8GB DDR3

Thanks for the help. 

[Paul_Tikkanen]

Hi:

It sounds to me like W10 is installed in Legacy mode.

You have to install W10 in EFI mode in order to enable secure boot.

You can do that by booting your W10 installation flash drive from one of the bootable EFI boot sources listed in the F9 boot options menu (EFI DVD, or EFI CD).

After you install W10 in EFI mode, you should be able to turn on secure boot.