My iPhone 5 Jailbroken on iOS 6.1.2 wont connect to any computer via usb. I tried numerous cables, all the usb ports on the computers, tried on PC and Mac and still nothing. I tried disabling mobile substrate by powering off the device and then holding the up volume button and when it booted it still would not connect to the computer. It charges just fine when connected to wall power, car charger, or even a case charger which makes me think it is not the hardware thats the problem. I am not sure what else to try could someone please help me out with this I would greatly appreciate it and would be forever grateful. Thanks!!!