My iPhone 4s will not connect with my mac pro

hey, so i have an iphone 4s with the latest update iOS7.1 and a macbok pro which is also up to date with itunes 11.1.5. The entire time ive had this computer and this phone all i had to do was connect the two via USB and my computer recognized my phone as well as itunes and proceeded to sync all my things automattically sometimes it would do it even if the devices werent connected but even if they were close in proximity they would connect, no problem. BUT now it will not do that when i connect it via usb neither one recognized that they are connected my phone will charge but thats about it, every once and a blue moon my phone will recognize the computer and ask if the computer is trusted to which i select "trust" and then it tells me its unable to connect but that barely happens most of the time nothing. Ive tried the typical restarting my computer, restarting itunes, searching for updates but its not just itunes that doesnt recognize my phone its my whole computer it seems, what could have happened to make these two devices unable to connect? how do i fix it?

iOS: Device not recognised in iTunes
Mac: http://support.apple.com/kb/TS1591

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