[Donatom3]

I had a problem with activesync all of a sudden on my computer had to go into the phone settings > connections > USB to PC > Uncheck "Enable faster data synchronizations". A reinstall of my comp was needed to fix the "enable faster data" setting.

BTW you can put your phone into the bootloader and load from USB. This will really tell you if hte USB port is messed up or not.

To go into bootloader turn off your phone completely not just screen off. Then hold the volume down button while holding that hold the power button until you get the tri color screen.

Plug in your usb and the text at the bottom should change from serial to usb if this is the case you can flash using the normal sprint execute file and don't need the card method.