Default Boot Device Missing or Boot Failed message on Lenovo Yoga - Microsoft Community
Acer aspire s7-392-9439: default boot device missing or boot failed. - Page 2 — Acer Community
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
Effectively Solved: Default Boot Device Missing or Boot Failed
Default boot device missing or boot failed - YouTube
Fixed – Default Boot Device Missing or Boot Failed on Lenovo/Acer
How to Fix "Default Boot Device Missing or Boot Failed" Error