Try hitting the Esc key and see if that helps. If not, it could be that the firmware doesn't have drivers for the disk type; or maybe the EFI boot loaders are on a filesystem that the EFI doesn't support.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
The EFI partition is on the SSD. No config file. The second HDD not scan. What is wrong?
Try hitting the Esc key and see if that helps. If not, it could be that the firmware doesn't have drivers for the disk type; or maybe the EFI boot loaders are on a filesystem that the EFI doesn't support.