Have a look to the following Steps
Step 1 # Try cleanup and reinstall of drivers
- http://www.droidforums.net/forum/galaxy-s3-general-discussion/216706-cant-connect-s3-pc-usb-3.html#post2340704
- Pull the SIM card out and do a factory reset with format
Step 2 # You can to use Samsung KIES (software for PC), or get your PC to recognize the "MTP" USB mode.
- Can I disable MTP mode and just have a regular USB connection?
- Samsung Galaxy S3 not connecting via USB
Step 3 # Make sure you install the Samsung USB Driver for Mobile Phone
http://www.samsung.com/us/support/owners/product/SCH-I535MBBVZW
Driver issues when using Samsung Galaxy SIII via USB for development
Step 4 # For file transfers, you can use Airdroid, which connects through wifi.
