Did you try changing boot mode in BIOS? Like what I did in this post: Missing operating system - Page 3 - Windows 10 Forums

Apparently I was lucky or whatever, but I did get it working. Look at my previous posts to see what worked for me. YMMV...

Breakthrough! :) I updated my bios firmware (not important, I assume), but changed to UEFI mode. Then installed a clean Windows 8.1 from UEFI-booted USB key drive (created with Rufus). Didn't install...

How about boot mode? I've only recently found out about UEFI mode, and know very little about it, so maybe a stupid idea, but really want to find a solution. I've only installed booted to Legacy bios...

Ok, thanks again.

OK, thanks. It's just that I haven't seen anyone with the "Missing operating system" failure actually having got Windows 10 properly installed yet. I think I'll try to install 8.1 clean, then...

Thanks, but did you actually try this (edit: or have seen a post/site where someone tried and succeeded), having had the same problem? I'm considering doing a full format of my SSD drive, then follow...

I've run into the same problem as well. Like Gaored, I've got a Clevo computer (under a different name, but Clevo based), namely the W370et. Wonder if it's a coincidence...