I'm working on a PC with Windows 10 Pro v1803 and a Gigabyte GA-Z87-HD3 motherboard & SSD. The PC is configured to have boot menu options for normal boot, Macrium Reflect Recovery and Safe Mode.

All works fine with fast start up disabled. With fast start-up enabled, the boot time reduces from 25s to 15s but the boot menu is inoperative. The boot menu is displayed in a low resolution and doesn't respond to the keyboard or mouse to select one of the three options. The PC then boots normally on expiry of the 3 sec timeout I set.

Any idea why the PC does this and is there a fix?