on 11.10.2018 17:58
on 16.10.2018 08:04
Sounds like the UEFI does not find any bootable device and because of this tries to boot from a network. Entering the UEFI with F2 should work though.
That you can't boot from the SSD before installing Windows is normal though, since there is nothing on it to boot yet. Have you tried booting from a Windows 10 installation USB stick or DVD?