Windows 10: Windows 10 no boot

Wife woke me from dead sleep to tell me PC isn't working. Go check and find the desktop on but nothing on screen. Hold power button to shut off then turn on.Computer startup initially seems normal (see Gigabyte post screen then Win 10 spinning icon blah blah...) then screen goes black but computer still running.
Wait.....nothing...computer still on nothing on screen. Rinse repeat same results until the Windows repair kicks in.

Wife left home but stated it was running fine and on the desktop when she left. After returning she found PC that way.

When Windows does get to the repair screen my keyboard does not allow me to select advanced. NO working keyboard. So I used (after restart) my bootable USB that will allow me to run the repair option but it fails telling me it was unable to repair Windows. WTF.

Computer has ran flawlessly and is cleaned out every 3 months (run filters) CMOS battery changed less than 1 year ago. No POST beep errors of any kind. New memory (G-Skill 16GB) was purchased ~1.5 years ago upgraded from 8GB.

I'd like to not lose my system files/programs given everything I have on it. So what are my best options to get it to boot & run?

PC specs:

Windows 10 Pro 64bit (Current build as of this date)
Core-i5 2500K (unclocked)
16GB G-Skill DDR-3 Trident X 7-8-8-24
Gigabyte GA-Z68XP-UD3 rev 1.0 (Award BIOS F10)
XFX HD Radeon 7870DD 256bit 2GB GDDR5 (17.10.2 drivers)
Sound Blaster X-fi Xtreme gamer
1TB Hitachi SATA-3 64mb cache
1TB WD Black SATA-3 64mb cache
1TB WD Black SATA-3 64mb cache
Rosewill Mid tower Challenger case
LG Blue Ray DVD burner
Antec 650w PSU

:)