Many things may cause this particular problem.
It could be a problem in the hard disk's MBR, in which case
DiskPatch will offer help.
There could also be problems with the volume that contains the
operating system, in which case the follow up action depends on what
you wish to achieve: if you wish to attempt a repair (if possible)
use DiskPatch, if you wish to copy files from the volume to safety
use iRecover.
Finally, the hard disk itself may be the problem; the hardware may
be failing. In that case use DiskPatch to attempt a repair (or
clone) or use iRecover to copy files to safety.
We can help you diagnose this problem, read
more here.
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