driver
This is what I see when I attach the phone to the computer. I have checked each item and updated all the drivers.
Go on Device Manager and check if any of your PC hardware is unrecognized. Get the drivers for the necessary hardware (Google is your friend here). I had the same problem as you and I solved the problem by fixing my driver situation.
Another possibility is that you have a faulty USB cable but this is quite a bit less likely.
Sent from my GT-N7100 using xda premium
This is what I see when I attach the phone to the computer. I have checked each item and updated all the drivers.