I've got my refurb 16GB iphone from ATT for just 2 months. 3 days ago, it just couldn't charge, sync or detect by my computers anymore. I've tried reinstall itune, changing USB ports, change to other computer, tried the wall charger, my spare USB sync cable. Nothing works. Although one werid thing is my car charger is able to charge it. I've also change to DFU mode, but the computer still doesn't detect, so I couldn't restore it either. Now my phone is unlocked, so obviously I couldn't send it in for repair, and I couldn't relock, because it wouldn't detect. I really need some help. Any advice would be very helpful. Thank you so much.