Now that I've done this more than a few times I'll share that I've run into a few blown OSes on laptops and used the following to bring them back to life.
1. An 8 or 16 GB USB memory stick.
2. The article at http://www.thewindowsclub.com/windows-10-media-creation-tool-create-installation-media-upgrade
3. When asked if the stick is for this PC or some other PC, answer for another PC.
4. WAIT! This will take a long time. Here about a hour.
When it's done you'll have a bootable W10 install and repair USB stick.
I've used this for full resets so far and not been saving user files since by the time the laptop gets to me they already saved their files.
-> My tip here is to do this before you need it along with your usual backups and W10 recovery media specific to your PC.
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OK, the change in W10's licensing really works for us here. If the laptop or PC has been running W10 we can do the full reset without having a CD KEY to worry about. W10's license is some hardware hash so we can boot this USB and reset the PC and get it working again.
I see a lot of blown PCs but haven't tried the reset and save user files yet. Let me know if you do this here.

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