Freezing and wont boot! Emergency!

Hello.
I have a quite big problem with mg Macbook pro. Its a 2010 mid, 15 inch. I have a normal harddisk, and not a SSD. The problem is that, about once an hour, all my programs/desktop freezes, and only the Mouse is working. And, either it Will turn of and shut Down, and boot with The Grey map with a White question Mark, or The Apple and The loading bar and load forever. Will a New disk Work out?
Thanks for your help.
Ny exams Are soon, so really need help!

Possibly it's the hard drive or hard drive cable.
Unfortunately is could also be this:
computer crash, restarts - mountain lion.
Where Linc says:
"Unfortunately, you have the MacBookPro6,2, the Edsel of Macs."
There was a recall on this model that has unfortunately ended.

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