Yeah, this would indicate a problem with the USB connector (I recommend this topic for pictures). In this case you have two options:
- Buy a new motherboard (over 100€; creates a lot of waste, if only the USB connector is broken).
- Go to a mobile phone store and ask, if they can help you. It is reported (at least with an independent store in Vienna) that they can fix such issues within the hour, at a far less expensive price.