is the hard drive light showing signs of life?
how big is boot drive? if several tb it might take a while to clear it.
if it shows no signs of life shortly, I would think its possible the reset isn't working. I would do a fresh install instead as resets tend to break a lot.
On another PC, download the
Windows 10 media creation tool and use it to make a win 10 installer on USB
change boot order in BIOS so USB is first, hdd second
boot from installer
follow this guide:
http://www.tenforums.com/tutorials/1950-windows-10-clean-install.html
when you reach the screen asking for licence, click "I don't have a key" and win 10 will continue to install and reactivate once finished
On the screen where you choose where to install win...