Hello. I've got an iPhone 3GS and it's been working fine for weeks. Then all of a sudden, now when I plug in my iPhone to my Mac it does nothing. No recharge, no connection. It recharges when I plug it into my outlet, so it's not the chord. I've rebooted both my iPhone and my Mac. I've connected it directly to the back of my Mac and still nothing. I found that if my Mac is in sleep mode and I plug the iPhone in it awakes the Mac. But still no connection. Any help?