Black Screen Before Windows Login

Albeit having adjusted no fast boot settings, my system suddenly began to stop displaying any boot options on screen before Windows login. The system now just shows a purely black screen for the first 10 seconds, until Windows loads up. How could this have happened? How do I revert this change?

SOLUTION: Turns out a Windows update messed with my UEFI settings. To fix this issue, in Windows go to "Change Advanced Startup Options" and then press "Restart Now" below "Advanced Startup." Then, select "Troubleshoot" in the menu displayed after restarting and "Change UEFI Boot Options." Windows will then restart again, allowing you to enter bios and disable fast booting.