I was trying to install Windows 10 on the recently purchased Gigabyte BRIX-BXBT-2807 that I got the other day and I was struggling.
It would boot the Windows 10 USB up without any issues and would then allow me to go off and install it. Windows copies the files to the disk and then reboots as any normal install.
On boot, it would then however sit there at the boot screen and wouldn't even boot into Windows to continue the install. Uh-oh.
After playing around, it turned out that the way to solve it seemed to be to boot into the BIOS and switch the Operating System mode to Windows 8.x (rather than Windows 7).
But not really well documented anywhere that I could see!