If you are certain the motor is not running and it is the hard drive and you have EXHAUSTED ALL OTHER OPTIONS then...
you can try a DISK SLAM
YES, I am serious...
Take the drive out...
Lay it on a sturdy flat surface, and raise it off the table 4 or 5 inches and briskly whack it FLAT on the surface. You have to whack it sharply and flat (no corner hits the table first)
This will sometimes dislodge whatever is preventing it from turning
THIS IS A LAST RESORT- just before you are ready to toss it in the garbage ONLY. If you have plans to send it off to a data recovery company, then dont do this.(at least not too hard)
I have seen this work more than once
I’m sending it off...the maker of the unit is paying for a data recovery for me.