Sony Nex-3n microUSB recognition and charging problems

My Sony NEX-3N is no longer charging via microUSB or being able to transfer the data to my pc via USB, the camera recognises that i connected a cable by entering the USB Mode, but it wont turn the indicator charging ligth on or be reconized by my pc wich always recognizes it. After a few seconds connected the camera says check the connected device, but im pretty shure the problem is on the camera or MicroUSB jack or sommething like that. Thanks!