@mimi1255 That only partially solves the problem. Now your network, as far as I can tell, is handing out boot files for UEFI machines. This will cause unexpected things whenever you get new systems in as most are now coming with default settings of UEFI enabled systems. While you are correct that you will need to turn off secure boot, this will not (at least I don’t think so) fix the problem you were seeing when you were UEFI booting the system.