Hi guys, my s3 usb get some problem. It can be charge normally, no problem in charging, but it can't connect to computer, or should say, computer cannot detect my s3 even i tried different cable and different computer. I was tried much searching from online even download the usb driver or kies or whatever, it still not work on my s3, is there anyone have same issue as mine? i flashed my rom previously, is it affect by flash rom? help me pls, thanks very very very much!!
It's most likely a physical issue - a bad / dirty contact in USB connector.
Try cleaning with toothpick. Look up in Youtube, there might be a guide to how to do it without damaging anything. If cleaning doesn't help - try changing ROM, if it doesn't help - then USB connector likely needs replacement.