Welcome, my name is XXXXX XXXXX I will assist you today!
I cant be certain if the hard drive is bad, but it definitely sounds as if the hard drive needs to be repaired.
What your going to want to do is run two repairs.
First, your going to want to repair your disk. Heres how
First, start up in safe mode.
Once in safe mode, lets repair disk permissions first.
Open your finder ( magnifying glass ) type in disk utility, and launch the disk utility application.
On the left side of the disk utility window, click your mac hd, then at the lower right hand side, click repair permissions .
Once the permissions repair completes, next on t he left click your mac hd.. Then click repair disk ( not repair disk permissions )
Once it has finished repairing your disk ( which is your hard drive )
Restart the mac and it should run normally, as well as it should be running a tad bit smoother and faster.
If you get stuck or run into any issues, let me know.
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Senior Technician and Network Switching Systems Operator / Maintainer.