Hi and thanks for reaching out. My name is Bernard a Windows fan like you. I'll be happy to help you out today.
I understand the issue you have, there is nothing to worry I am here to help, this is happening due to misconfiguration on the BIOS, I suggest resetting the BIOS to default settings and enabling the secure boot again.
Reference: https://forums.tomshardware.com/threads/blank-s...
To reset the BIOS you may also check the steps from here: https://www.wikihow.com/Reset-Your-BIOS
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Let me know how it goes and I hope that helps.
Bernard