Originally Posted by Scripts
I've just recently had this problem as well. Add pictures to show what it says or does when you say it doesn't work. If it charges the battery and displays the icon and notice that it's plugged in on the phone, then you'll just have to uninstall or disable the device on your computer and try it again for it to work.
I found it. Go under Storage > Menu > USB computer connection
I realized that there were no check-boxes marked. when I clicked MTP, it installed.
Dash: EVO ROM
Previous Android Devices: G1 | MT3G | N1 | NS | G2X | D2G | SGN
Current Android Device: SGS3 - CleanROM7 | N7LTE - CM10.2 Unofficial Nightly