The hard drive does not power up therefore it will
not make any "spinning noise."
The hard drive is not "seen" by the computer when
connected. It does not show up in "System Devices" in Windows or "System
Profiler" on a Mac.
The actual hard drive device is "seen" by the computer
but the files are not accessible. This is less common.
Common Issues
Typically manufactures like LaCie, Acomdata, Rocstor,
etc., will use drives from many manufactures.
Seagate, Western Digital
and Maxtor use their own Drives.
The Hard Drive
should be removed from the enclosure for proper diagnosis. However,
there may be warranty implications if the seals on the enclosure are
broken.
The hard drive can be tested directly once removed
from the enclosure.
If the enclosure is bad you can connect the hard
drive directly to the computer and copy the data to another location.