I got an Acer Aspire One Cloudbook 14 (AO1-431-C8KZ) last week from a friend.
Turning it on displays the Acer logo, and few seconds later, a screen with the message "No Bootable Device" and a little HDD logo.
I entered the BIOS using the F2 key. The computer was in UEFI mode, with Secure Boot...