IPhone not recognized on new macbook pro?

For Christmass, I got new macbook pro. On my old pc, my iphone 4 running 7.0.4 would never be recognized but would somehow charge. On the iphone itself it says "would you like to trust this iphone" and similar messages as if it were connected but the iphone tab never was there. Same on my macbook, help please?

Something is wrong with your iPhone, call Apple and see if they will help walk you through the problem.

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