Mac still frezzes after reseting SMC and PRAM

hi everyone!
I'm kind of noob here but my story is...
My macbook pro is a mid 2012 and i am having a strange problem. My mac started to became slow and constantly showing the spinning pinwheel in every move. So i've changed the hd (that originally is a 500gb 5200rpm) for a 160gb that i've found in my home.
I've changed it and re-installed the OS X Mavericks and the spinning pinwheel still show up. So I've decide to reset the SMC ( with the original hd) and no sign of change, reset the PRAM and still the same, then I've re-installed in the 500gb hd the OS X and get back to normal, but that was yesterday.
Today the pinwheel show it up again...
I am going to buy a new hd but I'm afraid that nothing changes.
If anyone have a idea, i'll thx a lot!

Sup guys!
Well, i've bought the hd and that resolved the issue, so that was the solution for this one!
bye!

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