I have Lenovo IdeaCentre K430 it has windows 8.1 loaded on to it. I wan't to boot from the DVD drive. I go into Bios and into the Boot priority list and it shows all the different options to boot from. However when I start up the machine and press f12 it shows the boot priority list and it only shows 1 item in the list, the main hard drive. Now let me tell you what I have tired. First I tried changing the boot priority list order, that didn't change anything. I then excluded everything from the list except for the DVD drive and that gave me no options to boot from. I tried disconnecting the Hard drive power so it wouldn't be seen and that still didn't change anything. I can't even get it to see a USB connection either it will only see the hard drive. I also made sure it did'nt have rapid or speed boot enabled. I have checked every option I could find in Bios and I still can't get it to show anything else but the harddrive.