Hi there i face problem that certainly i am plying an videos . So there occur an error .My laptop told me restart it and i found a resturt option.When clicking restart my lapto shows that 'Default boot device missing or boot faild.Insert recovery media and hit any key.then select boot manager to chose A boot device or to boot recovery media.' Now i can not open my laptop . My exam is knock at the door. pls help me without laptop i can not study enough.included that i am useing Windose 10 operating system.