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HP Elitebook 840 G4

It is a factory Windows-installed laptop. HP Elitebook 840 G4
Had got a new SSD installed, installed windows 10 (legacy mode off) downloaded from microsoft website. Worked good for 2 days, but on 3rd day - got this error at boot (photo attached) - "BootDevice not found. Please install an operating system on your hard disk. Hard disk (3F0) F2 system Diag.."
What was worse is the SSD was not getting detected & shown anywhere in BIOS/Boot menu.
Replaced SSD with new WD Green SSD, installed Windows 10 (legacy off). Installed all drivers. Again after a day, when I opened windows explorer, suddenly after black screen - the exact same error on boot appeard "BootDevice not found. Please install..". Restarted - windows booted normally. This is frustrating.
Please help with this.

 

Windows 10 USB media created with latest downloaded microsoft tool.

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