I wish any of the above worked for me. I have the same problem. Using ALT F10 it tells me, Default Boot Device Missing or Boot Failure. Insert Recovery Media and Hit any key Then Select 'Boot Manager' to choose a new boot device or to boot recovery media. I then stick the flash drive in the USB and press enter. The boot manager pops up on the screen. THe only option listed is the flash drive. I choose the flash drive, the computer boots to the flash drive, where i have 2 options troubleshoot and turn of your PC. by choosint troubleshoot I get to a screen with 3 options, (1) refresh your pc that tells me the drive where windows is installes is locked. Unlock and try again. (2) Reset your PC which seems to work but after it finishes, I try rebooting PC and it tells me there is no bootable drive.