Legacy mode

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...

Hi, so long-story short, hard drive died in our Acer Aspire E5-511 laptop just out of warranty, so we did a home replacement, everything went well, we didn't break anything despite the horrific design but then we encountered an issue. The screen said 'No bootable device', simple fix right? We...