booting does not show the choices for different HDs any more

Hello - out of the blue the choices for selecting my different hds does not appear any more when starting an unattended boot process. However when starting the boot process from the UEFI surface by selecting any of the hds to start from, then the choices appear again and the booting continues as it should. So presently I have to start my PC each time by manually activating the BIOS (UEFI) first and go from there.
So I have the hope that EASYBCD can fix the problem "somehow". Help is highly appreciated.
P.S. I once saw the Windows message that the Winload.exe could not be read - strange...