How much info was on the hdd? Since you reset it and wiped everything, it can take a long time to reset a 2tb hdd.
Is there activity on the hdd light on case? (assuming case has a hdd activity led) if its still flickering I wouldn't stop it. If its not doing anything, it could be frozen
I often find resets get broken and can go too far and wipe windows completely.
You might be better off fresh installing windows - On another PC, download the
Windows 10 media creation tool and use it to make a win 10 installer on USB (if you don't already have one)
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 10, if it gives you an error about GPT drives, delete all the partitions on the hdd and press next. If it still gives error, cancel out of the installer and restart PC and start installer again, it will accept next on that screen this time (some PC just need a restart here)