Window 10 is DEAD and how to do the new COLD BOOT !        
Old F8 Safe mode does LIVE !     
But MS killed the F8 key ,  how fun is that? 
From Windows 95 forward the F8 worked, but not now! (Fast boot technology  can fail)
If windows still runs a bit, do this in power settings (ASUS help)
(we do this before HDD cloning to SSD or a new motherboard)
If you PC runs bitlocker (hdd encryption) I can not help you. Sorry.

The PC shows windows loading forever is a common symptom.

The dots on screen spin in a tight circle , endlessly?

There are 2 paths here (PC dead, or you want to always cold boot the PC so this death thing does not happen ever again (prevention) The prevention is one click only.

Ok, you PC is dead, and your land here, no prevention possible. (per above link)
The fix is simple in theory (and practice too) Only one file needs to be deleted, seen in red below.
These are the ropes. (ways)
  1. Use recovery mode or the recover DVD to get access in command mode. (cmd.exe or new DOS as some call it) and delete the file in red  file below.
  2. Use linux boot media (usb stick) turn off safeboot in BIOS or booting to alien devices will be dead too.  Boot to linux and delete the red  file below.
  3. Get a Windows 7/8/10 PE boot DVD or USB drive, and use it to delete the red  file below.
  4. There are other bood DVDs and CDs that allow access to files on PCs , google that find that and use that, its endless this topic to delete the red file.
The below sections coverS the most common after death repair methods.

This mode is really windows 10 FORCED COLD BOOT.

Keep in mind a bad HDD (crystalinfodisk) free , parameter C6 not 0 can cause this sys file to go corrupted easy.
If you are savvy tech. guy, and can delete this fail by hook, crook or magic,  you WIN. C:/
If you can boot to a old LINUX CD or USB stick that can see NTFS fails, this is child's play, new Linux sees NTFS but will not let you touch it.(permission rules changed)
If hardware is bad, that must be cured first or doing safe boots is not going to help much.
If the PC HDD and  memory are not bad the below can work and fix this error super easy.
Fast boot uses a what I call a mirrored RAM boot. (it runs the echo of the last RUN)  yah, tricky and problematic at times.
The cure is cold booting the PC, but normally it actually warm boots from a mirror image of last boot.
The PC  boots from a mirror image from hiberfil.sys
(a fast start up feature  gone awry)
See hard disk or 
HDD/SSD to test it if is dead , weak or good.
The cure is easy, power on and quickly Hammer the F11 key until you see screen 1 below.  (hit f11 like wood pecker, or as kids say today spam the F11 key (wow))
Then pick See advanced repair options, click that now.
Then pick  startup settings,
Enable Safe mode (means cold boot in our context here)
Press restart on last screen menu below.
If Windows runs ok now, then reboot the PC and all is cured. (easy onces you know the steps)
I call this internal recover mode. (you can do the same thing with any W10 install DVD, or using the command prompt mode.

The 3 clicks are here. If the auto recovery screen does not POP, then use the F11 key to get there.
The auto recovery screen can be seen on say the 3 power on failure, I think the OS keeps track of the failure counts and then pops this screen/

  THIS IS Auto recovery mode.  This menu may auto pop up if the PC fails to boot 3 times in a row.
the goal is get to here, first. CLICK Startup settings.
Line 4 is the new W10 Safe mode. This replaces the old and loved F8 safe mode key.
See the above, now you know  where those geeks at  MS hide your F8 key, it's gone now, but moved here. (W10) Enable Safe mode, F8 gone)
This also cold boots the PC, and does not use the mirror boot method.
In my case I click safe mode then Restart and WINDOWS now works, I then reboot hard shutdown and  start over and my PC now runs like new, (the SAFE MODE deletes the hiberfill.sys data old )!!!
This mirror file was corrupted, and windows is too lame to notice that, and then ask you, "Dear owner would you like to cold boot now?"  Gee.
The causes are  many, but all causes are bad hardware, or say a gross virus attack.
Pretend Enable Safe mode has this at the end (Reset Fastboot)

Nothing beats EXAMPLES:
My PC failed due to my SATA3 (6g) PCI-express card died, (put in new one) and guess what, the hiberfil.sys file is now corrupted. (a W10 feature that, but can be turned off)
Keep in mind all my PC are MBR , disks, all are SSD or M.2 drives that never ever use UEFI or GPT modes.
OMG, hiberfil.sys is bad now. (it turns out  many things now can corrupt the windows boot files, not just a virus or bad hdd/ssd or bad RAM.)

The other bad thing  is in safe mode the Control panel power applet, is dead, when launched , all advanced modes are grayed out, cute no? (sarc off)
Get that clear,  in Safe mode, I can't turn off, hibernate. Dang ! MS loves to brick wall me here.

 CURE 1: (turn on boot legacy mode is one cure)
This is a temporary fix,  we do this fix the PC it runs great then we put it back like W10 had it before:
FIX #1,  In command prompt, you can in fact set legacy F8 back on, using command #1 below.
Cmd.exe (in run box type this) and run as ADMIN (called an Elevated Command prompt or the command  fails)  {It will say successful , if  it was}
  1. bcdedit /set {default} bootmenupolicy legacy
  2. bcdedit /set {default} bootmenupolicy standard
Reboot the PC ,power ON, and quickly hammer the  F8 key, just like you did for since Windows 95,  bingo F8 lives again ! and with it a fresh cold boot and all fresh windows kernel and its drivers. all fresh.
Photo of F8 working after above Red command is issued
No kidding it WORKS !

Once the PC boots and runs ok, you can regress the above steps and all magic image files will be refreshed and clean.
For sure hiberfil.sys  is renewed.

Method 2: (a 2nd way to skin a cat as grand-dad used to say, he meant wild cat ,ok? not Garfield he was born in 1890 !)
HP year 2006 and newer the F11 key ,takes you to HP recovery mode (hammer the f11 at power button ON)
Your PC if not HP but is DELL (never buy PCs from non USA companies)
This F11 only works on REAL HP computers that have not been HDD replace or fresh loaded using a MS W10 install full. (I call this a not slammed PC)
you have to use the command prompt to manually turn off hibernation.

Boot from the Windows 7/8/10 DVD, and press Shift+F10 at the language selection screen, and Boot to the System Recovery Options screen, and select the Command Prompt.

To turn off or disable hibernation, type the following command at the prompt:

powercfg –h off

All related commands:
By opening an elevated command prompt (or above recovery page) and typing

Powercfg /hibernate off  (enter key)
These setting ,are global to all accounts.

Disabling "Turn on fast startup"  cures all corrupted hiberfil.sys file problems.

This forces cold boot on , Fast start is off and hibernate off.)
and no more hiberfil.sys

powercfg -a      (full status message , only, and  does nothing to pc,it is a passive query.)
powercfg -h off  (means disable hibernate modes)
powercfg -h  on  (avoid using hibernate)
powercfg /h /type reduced  (reduces the file by half)saving ssd space.

end command line cures.

PREVENTION ( and ouch is worth a pound of cure? sure !) omg 2 second longer boot times, omg, will we need shave again waiting?)
The odd duckly W10 is evolving fast, the Power OPTION was in control panel but may end in the new SETTINGS panel.  (I've not a clue when !)
Click change.......currently unavailable , first, to Un-Gray the below options.(this is MS silliness to the extreme)
Then Un-check "Turn on fast startup."  (this makes the boot slower but no more BSOD'S from the corrupted hiberfil.sys file again. ( but to be clear, it was bad hardware that caused this)
Do this and keep it like this or at least until the PC is healthy again. Nothing else needs to be done , just this if  only you can reach here,  being all PRO-ACTIVE and all.
Just click change ....currently unavailable.... (silly) then turn off faststartup,
end easy fix.

Enemy #1 ( If hiberfil.sys  gets corrupted) This is the FASTBOOT file too.  It's a mirror file.    If running in safe mode, turn off fast boot, first. then  you can delete these files.

GROSS hacking ways? (running safe mode fails?)
If in a panic, you can try deleting,  hiberfil.sys,  and let W10 find that and force a DEAD COLD BOOT. (even  a Linux boot DVD/Stick  delete it !)  {not tested by me, this delete action}
In the old days,
we could delete all 3 sys files there and the OS would just rebuild them... (The OS sees it missing as the dirty bit, true and does a rebuild) W10 still does !
We  always could  delete 2 files, the hiberfil, and the swap files, in fact we could even turn off swap memory totally , to delete files then put it back later.
Keep in mind all files here are hidden,  so change this, in control panel  +File Explorer options, + view tab,  windows hides these from you. (turn off hidden files)
All you need to do , is find a way to delete hiberfil.sys, using any methods.
If at wits end, I use a Linux boot disk, and delete the 3 files seen above, or just hiberfil.sys. (this is the mirror warm fast boot file and hibernate file)
If it repeats,  you have bad ram... or a bad driver, or even bad HDD  The HDD is easy to test.
The most newer Linux will not let you edit your windows files, you must give linux this command to tell it to turn off alien secuity.  (boot to Unbuntu V17, Linux using demo mode,(try-me))

The top causes of the hiberfil.sys file mirror being corrupted  is bad hardware.
RAM or HDD failing. (remove all RAM (DDR2,3,4) from the PC and use only one ram stick to see if this cures corruption.
If you don't like getting a corrupted hiberfil.sys,  then turn off fast boot now.  (or until the true hardware failures are found and cured)

 LINUX fix , using command line. (the modern GUI mode will not let you deleted this file)
(you can make your  own disk and Microsoft teaches you how)  See me do that here?
Then boot it and open the PC under repairs, BOOT drive  and delete the hiberfil.sys
At the console in Linux type, (then enter) as seen here.
mount -t ntfs-3g /dev/sda5 /mnt/win -o remove_hiberfile (  you MUST use sda1 letters and numbers that match YOUR Drive , this is only and example)
As you can see they have secret  command just to do this act.

PE fix (Windows PE 10 ) fix.  This is my most favorite way (on any dead W10 BOX that will not boot)
Step one on newer PCs (not mine) go in to BIOS , and turn off UEFI SAFEBOOT now. This step makes the alien boot devices magically start working again just like all older PC's ever made.
Power on my PC, (a laptop) hammer f9 key  I pick My Sandisk USB stick and then hit space bar until the PE boots (boot menu on the fly)
I have Windows PE10  on a stick usb thumb drive. (does not everyone serious about PC service?)
PE boots.
I do just one click here and the hiberfil is gone.
The reboot the PC , USB stick unplugged.

I think I covered all ways from Sunday to kill dead that pesky hibefil.sys.  (PE above wins the bet/game and the most easy of all ways for sure)
Please do note , if the PC is dead, RAM bad or bad HDD, nothing on this page is any kind of cure. (run full HDD tests now)

version 1.  10-7-2017 (revised 7-30-2018)