Mac book pro 2009 having trouble detecting drive

I just got this macbook pro and put a 320 wd hard drive in. Problem is it doesn't always detect the new drive when I boot up and if I go to unmount it to format it stopps detecting it. I am 90% sure it's the hard drive cable I just wanted advice before i spent money on a new cable. oddly enough it didn't start detecting it until i cleared to the pram

I dont like Mavericks, I have had trouble with it since day one of installation...Is it SIMPLE for me (a non computer goo roo) to delete Mavericks and go back to my Mt Lion?
Thanks for your response!

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