"Samsung Galaxy S 2 will not sync with my PC."に関する回答For those who are still having problem of phone / tablet not working on computer. I had same problem that I kept tackling and somewhere found this solution on the internet. Try disconnecting phone from computer. Turn on Airplane mode and reconnect phone to computer. I had gone through sooooo many posts and installing /removing apps before seeing the post about Airplane mode. It worked for me when no other solution worked. After computer recognized the phone and was mounted for file transfer one time, I was then capable of connecting phone without turning on Airplane mode. Connection has worked for me ever since.