Why is my Iphone 4 screen not working? - 1

I bought an iphone 4 from a friend and the phone worked fine. I updated the phone to IOS6 and then I started having all these problems with the phone. Certain spots on the screen won't respond when you click on it. Now the whole screen won't respond. I took it to the apple store and they didn't know what was wrong with it and wouldn't help me because apparently my friend got the screen replaced and she didn't do it with apple. Can anyone help me? Can I just get the screen replaced would that fix it?

Added (1). I have already restored it and set it up as a new iphone multiple times and I have also tried resetting it by holding the home button and lock button and none of that works.

If your touch screen no response, i suggest you buy the digitizer touch panel here http://www.etradesupply.com/apple/iphone/apple-iphone-4-at-t.html

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