The more you try and access the drive, the more chance there is of further damage and data loss. (This is especially true when using OS X as HDs are quietly optimised and cleaned on the fly.) Do not post the drive if you can help it, if something is loose inside then DON'T shake it (actually don't shake anything electrical, it's not a Polaroid)!
It will be expensive and most companies don't guarantee success, it is unlikely you will get clean data back unless a mechanical flaw stopped the disk from engaging at all. If the data is really important then stop playing with the drive yourself and seek proper help. Good luck.
The more you try and access the drive, the more chance there is of further damage and data loss. (This is especially true when using OS X as HDs are quietly optimised and cleaned on the fly.) Do not post the drive if you can help it, if something is loose inside then DON'T shake it (actually don't shake anything electrical, it's not a Polaroid)!
It will be expensive and most companies don't guarantee success, it is unlikely you will get clean data back unless a mechanical flaw stopped the disk from engaging at all. If the data is really important then stop playing with the drive yourself and seek proper help. Good luck.