I've been trying to get my iPhone to sync somehow for quite some time with no luck. Last I tried, I had my iPhone set up to sync over wifi but now it will not come up on my Mac Pro. Following this failure, I tried to do a wired sync using the factory lighting cable, yet my Mac Pro does not recognize my iPhone at all. It won't show up as being charged or on my computer. Everything is up to date, I have tried my Macbook Pro and a second Macbook Pro using three different factory lighting cables with no luck... Any idea of the issue? I really only want to go to the Apple store as a last resort (too crowded) but even if that is the issue, I don't even know how I can back up my phone without using my computer (or having to pay $xx for iCloud for an issue I did not create). Ideas?