Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, that a RESET was not corrective is rather concerning.
Still, have you tried removing the battery for an extended period of time? ...with no battery, press the reset button every now and then?
Re-install the battery and press the reset button again but longer?
Yes please as we're trying all hopeful workarounds.
If conveniently able, yes as this would be the only user doable attempt.
All others would require dis-assembly.
Consider/try the RESET and the turning on with the camera in a different position/orientation. The internal high speed motor of the HDD results to a gimbal like effect when spinning. Trying in a different position/orientation hopefully may gently 'jar' the HDD back into action.
Yes please as again we're trying all hopeful workarounds.
IF all othe above were not corrective, then it would confirm the internal hardware issue or more particularly, a failed HDD.
On "...Is there a way to recovery the video on my hard drive...", possibly but largely dependent on the extent of the HDD failure and it would require specialized recovery services / not user doable.
If of interest: