Prior to my SIII having charging/syncing problems it would connect to my Windows 8.1 PC without issue. When I started having charging/syncing problems I had the USB charging port replaced by a local store. Since then it won't connect to the PC for me to transfer files to the S|D card or the phone itself, phoned the store where I had it done and was told it should be the same driver. I connected my girlfriends S3 to my PC went into device manager and uninstalled the drivers for the phone and then disconnected hers re-installed the drivers still won't connect (but hers will without issue and it same make model phone only difference is the cell provider) did a windows update and it installed some Samsung drivers, but still won't connect to PC. I should mention it won't connect to PC but it will charge the phone. I tried shutting phone down pulling battery and waiting a few minutes replacing battery and powering on phone also rebooted the PC and still the same issue it won't connect to PC. All I get is USB device not recognized error. Would just having my old USB charging port changed and a new one soldered on change which drivers are used to connect it to the PC? Is there anything else I could try that would let me connect and transfer files to the SD card or the phone?