My Samsung S4 won't connect to my computer I have downloaded Samsung Kies 3, and the computer wont even find the device. I have tried different USB ports and nothing seems to work. I have tried changing it to a media device manually but I cant find the right spot. What else can I do to get the device recognized?
I guess your Device drivers wasn't successfully installed in your pc

Here is couple of things you can do,:


Uninstall Kies
Go to device manager of your pc and remove/uninstall anything related to samsung
Reboot your device(optional)
Then Download Kies to your computer and while installing dont connect your s4 with pc.
After installation connect your Device and let it install device driver sucessfully. 


Hope this will Help you, For more information See this

S4 connect issue

Link 2