thanks for the reply , it booted before without fast boot enabled . my original OS wasn’t being recognised hence i had to do a clean install of windows on the other M2. drive but this is still not booting without fast boot being enabled. everything that is connect to the unit is working as before i just cant understand why i cant boot without it being in fastboot mode. i read on another thread here something about his OS wouldn’t boot Intel Nuc Hades Canyon HVK BIOS no POST - BIOS/UEFI Modding / BIOS Modding Requests - Win-Raid Forum (level1techs.com) and i was wondering is it something related.