Pavilion Desktop 595-p0074 won't get past HP logo screen on boot

[Tresio]

Pavilion Desktop 595-p0074 will suddenly not get past HP logo screen on boot. Power remains on, but screen goes blank and computer does not boot into Windows 10.

Diagnostics (both Fast & Extended) indicate Pass on everything.

Restored BIOS using Win+B on startup, but no change.

Tried to update BIOS to newest version (sp111912) for ROM Family SSID 843B, but "installing" sp111912.exe onto a USB flash drive only dumps a different file entitled 0843BF44.exe onto the flash drive, and UEFI utility doesn't recognize that as a BIOS file.

There is data on this computer's drives that needs to be preserved, so I'd rather not just total restore or wipe with a fresh Windows installation if I don't have to.

Thoughts/recommendations?

[WAWood]

@Tresio 

As an attempt at repair, I suggest you read the information below about making a USB stick that might be able to repair the Windows boot files so your PC can boot again.  If that does not work, then I can provide information about doing data recovery prior to attempting a system factory reset.

Windows PCs use two different sets of files to get you to a working desktop.

In terms of the first, Windows boot files, you need to follow the instructions below to create boot media from Macrium Reflect (MR) that can be used to rewrite/repair the boot media on your PC:
1) Download and install Macrium Reflect (MR) from this link on a working PC: http://www.macrium.com/reflectfree.aspx
2) Use the option to create a boot USB stick or CD

That will create MR bootable media. Then, you can boot your PC into WinPE using that media.

Have patience, as that can take a while to start and bring up the screen.

Once the screen is there, select the option to Fix Windows boot problems. It will then search for the OSs installed and list them, Select the one you want to repair and click Next.

It will now do the repairs, listing the things it has done.

When finished, select the option to Restart the PC.

If this worked, the boot repair succeeded and you will have your PC back.