Default boot device missing or boot failed. - Microsoft Community
Fixed – Default Boot Device Missing or Boot Failed on Lenovo/Acer - MiniTool
Lenovo Y540, keep getting this error every 2 or 3 weeks, Default Boot Device Missing. After restarting, gives a BSOD "WHEA Uncorrectable Error" then after restarting again, everything is fine. Both SSD
Fixed – Default Boot Device Missing or Boot Failed on Lenovo/Acer - MiniTool | Lenovo, System backup, Windows operating systems
Default Boot Device Missing or Boot Failed? Top 6 Solutions!
Default Boot Device Missing or Boot Failed
How to Fix “Default Boot Device Missing or Boot Failed” Error in Windows 8 | Vtechsquad Blog - Online Technical Support Services | Self Help
Fix: Default Boot Device Missing or Boot Failed
Default Boot Device Missing or Boot Failed? Top 6 Solutions!
Bought a new laptop : r/pcmasterrace
Fix Default Boot Device Missing or Boot Failed in Lenovo - YouTube
Lenovo thinkbook default boot device missing - Microsoft Q&A