Default Boot Device Missing or Boot Failed error message. - Microsoft Community
How to Fix "Default Boot Device Missing or Boot Failed" Error
Too hot to handle and boot problems - Framework Laptop - Framework Community
default boot device missing or boot failed | Acronis Forum
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
How to Fix If Default Boot Device Missing or Boot Failed - TechDim