Run diagnostic tools from the HDD manufacturer.
Also - TestDisk again:
A. At the first window, select “
No Log” and press the <
Enter> key.
B. Select which drive to analyse, choose “
Proceed” and <
Enter>.
C. Select partition type – Intel if it’s a PC then <
Enter>.
D. Choose
Advanced > press <
Enter>.
E. Choose
Boot > press <
Enter>.
New screen - please post back with a screenshot.
How to post a screenshot.