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Probably something to do with the UEFI set up.
Try to enter the bios and see if there is a setting for legacy bios instead of UEFI.
http://www.howtogeek.com/56958/This is probably a better link http://superuser.com/questions/496026/what-is-the-difference-in-boot-with-bios-and-boot-with-uefi
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Had that the other day on a Windows 10 machine, thought it might be terminal disk failure or corrupted boot sector.
Dug into bios and it turned out boot disk settings had changed from SSD & HDDs to floppy & CD so very easy to fix.
Never happened before, suspect it was Win 10 update related although buggered if I can see how or why.
Sony Vaio laptop I thought the HD had failed as I was getting "cannot find OS" error message on boot.
Created Windows 10 media on USB and DVD on another laptop and installed a new SSD (couldn't clone old HD) and done all the disk partition /setup/MBR things I can but it refuses to boot from either and will boot from a recovery disk but won't do a reset from it still complaining of partition and locked drives. What's the next step?