unable to connect my mobile and computer with usb when I plug the phone in via USB, the phone beeps, I get a lightning bolt on my battery, but that's it. There are no USB options in the pull-down status bar, and the PC does not recognize that a device has been plugged in
try this Methods, may be helpful for you, 


Try using different USB-Ports of your system.
Try with different USB-Cable your using to connect your phone and system.
Try to install the Mobile-Device Drivers and then connect to your system.