Iphone 5 won't sync with any computer?

I have a iMac and macbook and one day it just randomly decides to not sync anymore and i don't know why & I've tried everything from reloading my phone (holding top and home button) to deleting then re downloading iTunes, trying different usb cords different usb ports on the computer and nothing seems to work help! It charges fine so i'm sure its not the wire & it isn't jailbroken or anything so i don't know what the problem is but its making me mad!

If it's appearing in iTunes, just use manual management of music and video.

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