I'm having this same problem. When it was doing the recovery, a window came up and said it couldn't restart. I clicked on cancel I think (it was the only option) and it went to the HP logo and no further. I followed your steps and the system tests came back fine. I'm running the extensive test now but it could take a few hours so I thought I'd see what maybe else could be causing the boot fail. I backed up all my files so I'm not worried about losing anything, but it's acting like it lost the whole os. It's running Windows10.