My laptop gives me the 'No bootable device found' along with an icon but if I reboot it again it works fine. I read other threads where a suggestion was made to change the BIOS to legacy. I did that and it gave me the same error except it was slightly different. No bootable device found, press any key, check your cable connection etc. So I changed the BIOS back and was able to get it to boot up after trying twice. Any suggestions as to why it fails the first time but when I do it again it works? Thanks for your help!