My Lenova Yoga 920, which I just purchased about a month ago, has tonight shut down thrice, and after shutting down has displayed a screen reading:
Default Boot Device Missing or Boot Failed
Insert Recover Media and Hit any key
Then Select 'Boot Manager' to choose a new Boot Device or to Boot Recovery
Default Boot Device Missing or Boot Failed
Insert Recover Media and Hit any key
Then Select 'Boot Manager' to choose a new Boot Device or to Boot Recovery