(You might also try connecting your phone to a different computer. The USB port you are using on the computer is bad.Try using a can of compressed air to clear the USB port on the phone to ensure a good connection. There is dust or debris in the USB port on the phone.Some phones are also supplied with optional “charging” cables that cannot be used to establish a data connection with your PC. You are not using a good USB data sync cable, like the one that came with your phone.If your computer's Device Manager does not detect that your phone is connected, more than likely it's because there's no physical connection between the USB port on the phone and the USB port on the computer. (If you don't see the files, tap or click the name of your computer.) The name of your Windows Phone 8 should be listed under
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For Windows 8 users: From the Start screen, type "Device Manager," tap or click.Check to see that your phone shows up in Device Manager.USB ports on the front of a computer tend to be lower power. Don't use a USB hub or the ports that are located on the front of your computer. Make sure that you're using the USB data sync cable that was included with your phone.