https://play.google.com/store/apps/details?id=in.zatta.USB_switch try this. I use it often.

 

If the above suggestion doesn't work, we may need to look into your build prop file to make sure the usb prop didn't get messed up through the root process.

DS

 

Also, if you don't have wmp 10 or later ur pc won't read your phone either. Try installing that. http://windows.microsoft.com/en-US/windows/windows-media-player