@DG52,
Welcome to the HP Support Community!
I recommend you disable secure boot in BIOS and check whether the issue is resolved.
Follow the steps in the below article to disable secure boot.
https://support.hp.com/in-en/document/c04784866
If you continue facing the issue, then update the BIOS following the steps in the below article.
https://support.hp.com/in-en/document/c00042629
Let me know how it goes and you have a great day!
If you wish to show appreciation for my efforts, mark my post as Accept as Solution. Your feedback counts!
Cheers!
The_Fossette
I am an HP Employee